Which-Way Men

An investigation dossier for Cthulhu Eternal

MEMORANDUM 11-W Do not ask where the subject went. Do not reconcile the timestamps. Do not put the photographs in chronological order. If two witnesses disagree, interview them apart and keep both statements without deciding between them. The subject is dangerous while his history stays indefinite. He becomes vulnerable the moment one history is fixed. He also becomes visible, at that moment, to whatever made the indefiniteness necessary in the first place. Decide before you begin whether this operation is meant to capture the subject or to feed him to it.

The five deaths of Martin Vale

Martin Vale died at 21:14 in a locked room at the Hotel Bernier. A constable and two paramedics saw the body. There was a revolver in its right hand, a gunshot wound through the palate, and prints later confirmed as Vale’s. At 21:19, railway cameras recorded Vale boarding the northbound train, and the footage passed every authenticity test there was; his ticket had been bought three days earlier and the conductor remembered punching it. At 21:26, Vale stabbed an archivist seventeen kilometres away, watched by three witnesses, his blood on the broken handle of the knife. At 21:31, Vale phoned his wife from their apartment and stayed on the line eleven minutes, the call logged to that address, a neighbour seeing him through the kitchen window. At 21:44, a car registered to Vale hit a bridge abutment and burned, and dental remains identified the driver.

Not one of those reports was fabricated. None described an impostor, a twin, a recording, a hallucination, or any ordinary duplicate. The investigation stayed safe right up until Inspector Baines laid all five files on one table and announced that only the railway sighting could be genuine. Four bodies vanished. Aboard the northbound train, Vale screamed for seventy-three unbroken seconds, every window in the carriage grew the same hairline crack in its upper-right corner, and blue vapour came through all of them at once. That is the working definition of a Which-Way Man: a person who stays alive by making sure reality can never establish which history is his.

The name is institutional, not biological

The oldest surviving English-language file calls them Which-Way Men. It was about an interwar occult society whose known members happened to be men, and the label stuck through decades of bureaucratic reuse. The phenomenon is neither male nor a species. A Which-Way Man is an ordinary human being who has suffered an extraordinary failure of causal localization. Some fall into it by accident after Tindalosian contact. Some submit to a deliberate procedure. A few get so good at maintaining it that their original history can no longer be identified at all. They are human refugees who have turned their own biographies into camouflage, not Hounds or angular organisms wearing human skin. Some of them stay victims their whole lives. Some of them work out that any crime can be survived so long as another version of themselves stays innocent.

What which-way information actually means

In a two-path interference experiment, a quantum system can travel along alternatives whose amplitudes interfere. If those alternatives leave reliable records of which path was taken, the interference is suppressed. The thing that matters is not whether a conscious person looks. It is whether the path information becomes physically available. Write for path distinguishability and for interference visibility. Under the standard formulations of wave-particle duality,

Perfect path knowledge, , cannot coexist with visible interference. Perfect interference, , needs genuinely indistinguishable alternatives. Say two possible routes correlate with two environmental record states, and . Their distinguishability is a trace distance,

Zero, and no possible measurement on that environment can tell the routes apart. Large, and some record can reveal which route happened. A quantum eraser does not rewrite an event after the fact; it makes the distinguishing information unavailable in a chosen basis, letting interference reappear in properly sorted correlations. Nothing travels backward in time and no macroscopic event gets undone. An unsupported human body does not behave like any of this. People shed path information constantly into air, light, heat, witnesses, devices, and everything they touch, and ordinary macroscopic histories decohere absurdly fast. The real physics stops right there.

The Tindalosian axiom

Angular contact can drop a human causal identity into a protected sector, something like a decoherence-free subsystem. The person’s ordinary physical states go on interacting with the environment, but the information specifying which complete history belongs to the person stays partly encoded outside ordinary curved spacetime. The possible histories are not pristine quantum branches. They are macroscopic projections held open by the angular correlation, each locally real, each able to contain its own witnesses, injuries, relationships, and records. What stays indefinite is which projection is going to become the subject’s one admissible biography. Call the candidates . The subject stays hidden as long as no ordinary record picks out one surviving history strongly enough:

The histories can be grotesquely contradictory; the only thing that counts is that the total evidence has not yet made one of them uniquely authoritative. A Hound’s scent runs on recoverable causal history, and a body with five mutually exclusive biographies does not offer one continuous tether through curved time. The Hound can feel that contact happened. It cannot work out which projected worldline to cut. The ambiguity denies it a target singular enough to bite.

How the condition begins

The oldest procedure needs the prospective subject to reach an untreated angle while several consequential choices are genuinely still open. Assistants then manufacture independent records of mutually exclusive outcomes before the angular emergence finishes. One ticket bought and another destroyed. A letter sent and a letter burned. A weapon fired and a weapon left loaded. A witness paid to remember a departure and another told to expect an arrival. The contradictions are not there to fool human investigators; they are there to supply several causal structures for the subject to project into. At the instant of contact, the subject refuses every path on offer. Most candidates simply die. Some come out with one definite history and a stronger scent. A few come back distributed across the alternatives.

Accidental cases run the same way. A cornered person hits a moment where several incompatible escape routes have nearly equal causal support, the train and the car, confession and silence, suicide and flight, and angular contact stops those alternatives resolving the normal way. Once it exists, the condition only stays alive through work. The subject has to cultivate contradictory traces, cut identifying links, and keep any one institution from ever assembling a coherent account. That is why veteran Which-Way Men pile up aliases, marriages, deaths, convictions, and medical histories. Their paperwork is functioning as anatomy.

Signs of an indefinite history

Any single observation of a Which-Way Man is usually mundane. The Unnatural only shows up when records are compared.

• Two authenticated cameras put the subject in places that cannot be reached in the time available.
• DNA, fingerprints, and dental remains establish several mutually exclusive deaths.
• A healed fracture appears only in records tied to one address.
• Different acquaintances know the subject by incompatible dominant hands, allergies, accents, or ages.
• An object the subject handled has two chains of custody, both physically supported.
• A witness remembers a conversation whose consequences exist even though the other speaker was documented elsewhere.
• The subject’s reflection performs an action belonging to a rejected history.
• Medical imaging changes depending on which prior record the radiologist reads first.
• Injuries briefly coexist during an evidentiary crisis, then settle onto one body.
• Rooms crossed by several Paths pick up scratches, footprints, or bloodstains along incomplete trajectories.

No single contradiction proves the phenomenon. Fraud, bad clocks, institutional error, twins, corrupted data, and plain lies should all stay viable early in an operation. The horror starts when every sensible attempt to resolve the discrepancies makes the subject less ambiguous and more physically unstable.

The Path Track

Use Paths for the number of mutually exclusive histories still able to become the subject’s biography. Most experienced Which-Way Men open an operation on five Paths. An accidental or deteriorating subject might start on three or four.

Paths are not hit points. Shooting the subject does not automatically lower the track. A Path is eliminated when evidence or action makes that history physically incapable of being the subject’s final biography.

Preparing Paths for an operation

Before play, write three to five short Path records. Each needs four things: a location (where this history puts the subject during the operation), a choice (the decisive action this version took), a consequence (one injury, relationship, possession, or obligation unique to it), and an anchor (the strongest recoverable record supporting it). For Martin Vale, five Paths might run:

At least two Paths should hold something the Protagonists might want to keep. At least one should tie the subject to something monstrous. None should be marked as the original or the objectively true history. The investigation is what decides which Path becomes the biography of the only person left standing.

Eliminating a Path

A Path comes off the track only when all three of these are true. Contradiction: the Protagonists get evidence incompatible with that Path. Connection: they correctly establish that the evidence concerns the same underlying person and event. Commitment: they encode the conclusion in a recoverable form, a case theory, a sworn statement, a synchronized database, a shared briefing, a published finding, a deliberately calibrated measurement. A successful skill test supplies evidence or verifies a connection. It does not, by itself, remove a Path. The players have to choose to synthesize the information, and that distinction is what keeps investigation useful instead of punitive: competent Protagonists learn what each conclusion will destroy before they decide to make it authoritative.

One decisive physical record can sometimes eliminate a Path; more often it takes two independent records, and records are only independent when they do not come from the same source. A newspaper article, an online repost of it, and a witness repeating what the newspaper said are one record wearing three coats. Random falsehoods do not protect a Which-Way Man, either; the alternatives have to be causally supported, so a planted receipt only helps if the transaction, location, surveillance gap, possession, and human behaviour add up to a history that survives cross-checking. And note the asymmetry: proving that two records disagree can strengthen the indefinite state, while proving that one record cannot possibly belong to the subject eliminates the Path it was holding up.

Before the track reaches 1, the Protagonists can restore an eliminated Path by repairing its causal support until the competing conclusions are genuinely underdetermined again. That takes more than deleting an inconvenient file; they have to create or uncover enough authentic structure that the history could still be the subject’s final biography, which usually means an extended operation and at least two successful tests, with all the legal and moral weight fabrication carries. A failed attempt may eliminate a different Path instead. Once collapse produces one definite history, the discarded Paths cannot ordinarily be brought back. They are no longer hidden alternatives. They are amputations.

Cthulhu Eternal statistics

The profile below is an experienced Which-Way subject. Accidental cases keep the characteristics and skills of the original person and may have only one or two of these powers. Roll each subject or use the typical column; different people carry the condition.

WHICH-WAY MAN, human distributed across mutually exclusive histories

Skills: Alertness 70%, Athletics 50%, Bureaucracy 60%, Dodge 60%, Firearms 50%, HUMINT 70%, Persuade 60%, Search 60%, Stealth 80%, Unnatural 40%. Add any professional skills that fit the life or lives the Paths represent.

Movement: human. Armour: none at Path 1; at Paths 2–5, see Path Substitution.

vs Lethal Damage: HIGHLY RESILIENT while two or more Paths remain. A successful Lethality roll eliminates one viable Path and does HP damage equal to half the Lethality rating, rounded up. Describe the attack as completely fatal inside the eliminated history. At Path 1 the subject is NORMAL and takes Lethal Damage like any human.

Attacks:

Weapon Attack 50% or the appropriate skill, damage by weapon. At Paths 3–5 an attack can come from a viable location belonging to another Path, provided the target is physically reachable in at least one supported history.

Crossed Action 60%, damage 1D8. Two Paths perform mutually exclusive movements whose physical consequences overlap on the target: a blow lands from the wrong side, a closing door strikes before it moves, hands that never entered the room drag the target backward. Armour applies normally. At Path 3, Crossed Action gains +20%.

Rejected Injury 50%, opposed by POW. On a success the target takes 1D6 ignoring ordinary armour and loses 1D4 WP as a wound, pain, or physiological consequence stripped from one of the subject’s Paths resolves in them instead. The subject spends 3 WP and can only use this after a Path has been eliminated during the current scene.

SAN Loss: 0/1 to meet two demonstrably authentic but incompatible records of the subject; 1/1D4 to watch an injury or possession change when a Path is eliminated; 1D4/1D8 to see several histories overlap during collapse; 1D6/1D10 to grasp that your own investigation has selected which spouse, child, crime, death, or identity is now real.

Indefinite History

The subject may act through any viable Path but is one underlying entity: one turn, one action, one HP pool, one WP pool, not a squad of duplicates. They can only interact with things the chosen Path supports. If the railway Path holds the stolen index, they can read or destroy it while acting through that history, but they cannot pull the index out of the apartment Path unless a causal link moved it there. Effects that apply identically in every viable Path hit the shared HP and WP normally, so if every history puts the subject inside the same collapsing building, indefinite history is no defense at all.

Path Substitution

When an attack, restraint, or other consequence hits the subject, they may spend 2 WP and test POW. On a success they substitute a viable Path in which that specific consequence did not happen, and the consequence instead eliminates the affected Path if the event makes that history untenable. On a critical, the Path survives but picks up a new visible contradiction. At Path 2 this costs 4 WP; at Path 1 it is unavailable. It cannot beat an effect established across every remaining history, which is exactly why coordinated action gets powerful once the Protagonists work out what the Paths share.

Constructive Interference

At Paths 3–5 the subject may spend 3 WP to combine compatible consequences from two histories into one action: exerting force along two partial trajectories, attacking from a direction where no complete body is visible, using information a Path learned somewhere it never reached, passing an object between histories whose causal chains overlap, or applying the better of two relevant skill ratings. It does not grant a second turn, and it cannot combine mutually exclusive unique possessions without establishing how both affect the same event.

Destructive Interference

Once per scene at Paths 3–5, the subject may spend 4 WP to suppress one narrowly defined consequence shared by two Paths. A bullet lacks a completed trajectory. A door has no settled history of opening. A camera records the room before and after the subject crosses it but not the crossing. It stays local; it cannot erase a whole person, scene, or investigation, and the GM has to name the two viable histories whose alternatives cancel the consequence.

Causal Trespass

The subject may spend 3 WP to change which Path supplies their apparent location. To witnesses they leave one scene by a plausible but unobserved route and turn up at another Path’s supported location. No visible teleport. If every connecting interval is observed or reliably recorded, it fails, costs 1 WP, and produces an anomaly that may help eliminate a Path. At Path 2 it costs 5 WP; at Path 1 it is unavailable.

Evidentiary Predation

The subject instinctively feels which people, archives, devices, and relationships make the competing Paths distinguishable, and gains +20% on Alertness, Search, or HUMINT tests to find the sole witness, index, timestamp, chain of custody, or analyst who could eliminate a Path. This is the source of their characteristic violence. A Which-Way Man will ignore a room full of armed opponents to kill the records clerk who happens to know that two case numbers point at the same person.

Biographical Contamination

At Paths 2–4, details from discarded histories start bleeding into witnesses who hold strong records of them. A wife dreams of a marriage that now belongs to another Path. A surgeon grows a scar from an operation performed on the subject. A Protagonist remembers taking a confession no surviving history contains. Once per session the GM may call for a SAN test from a witness strongly tied to an eliminated Path; on a failure they lose 1D4 WP and gain one specific memory, habit, injury sensation, or emotional obligation from it. The contamination is evidence, and investigating it may make the remaining history more distinguishable.

Collapse

When Paths fall from 2 to 1, resolve it at once. The subject loses 1D6 WP and 1D6 HP ignoring Armour. Every injury common to the surviving history becomes physically definite. Its unique possessions, relationships, warrants, debts, and crimes become authoritative. Every nearby witness tests SAN at 1D4/1D8. The subject’s Scent jumps to Level 4 as described in The Scent, and within 1D6 minutes untreated angles within 100 metres start showing blue vapour or other signs of Hound localization. Collapse leaves the subject as one hurt, exhausted, fully human person and hands the Hound a continuous worldline to follow. It need not be immediately fatal.

Causal Failure

If the last Path is eliminated without another viable history in place, there is no admissible biography for the subject to collapse into, and every rejected injury and incompatible location tries to resolve through the same body. Treat the immediate event as a Lethality 30% attack against the subject and everyone within 3 metres; survivors take HP damage equal to the two percentile dice added together. The subject cannot use Path Substitution. If killed, the remains are incompatible partial anatomies and objects from several histories. If the subject survives, an untreated angle tears open nearby and drags them through unless a prepared curved containment field restrains them. Whether that frees them, delivers them to a Hound, or makes something worse is left unresolved on purpose.

How Which-Way Men behave

Newly indefinite subjects are confused refugees. They may not know which memories belong to viable Paths. They go looking for people they trust and find that different histories hold different relationships. Experienced subjects act like counterintelligence officers defending a live operation: they identify the records that connect their identities, keep evidence spread across institutions that do not cooperate, encourage several plausible explanations without proving any, destroy indexes and analysts and relationships before they bother with raw evidence, keep at least one harmless Path where surrender is still possible, and never let anyone, themselves included, decide which biography is the original. The worst of them treat Paths as expendable moral compartments. One Path commits the murder. Another loves the victim. A third gathers evidence against the killer. The underlying person claims innocence because no final biography has inherited the act yet. It is a metaphysically sophisticated defense and a morally worthless one.

Countermeasures

Find the invariant. Do not chase each manifestation on its own. Work out what every viable history shares, a person contacted, an object carried, an untreated angle crossed, a decision avoided, and aim your effects at that, because effects on the invariant cannot be substituted away.

Isolate without measuring. A continuously curved room with deliberately unsynchronized monitoring can restrict movement without immediately privileging one Path. The goal is to stop new causal traces while keeping the existing alternatives unresolved, and it is hard, because a containment protocol that pins the subject’s location precisely may itself eliminate every Path but the contained one.

Attack the linkage. The subject depends on several histories belonging to one underlying identity, and it may be possible to sever that common identity without deciding which history is correct. It needs an Unnatural ritual, an angular apparatus, or a modified Unremembering. Success produces several independent people, each certain they are the original, and hands every one of them a complete Tindalosian scent. In effect it distributes the likely execution across several people.

Construct a survivable history. The most humane move is to decide which Path gives the subject, and the innocent people around them, the least catastrophic definite life, and then make that history uniquely recoverable. That can mean falsifying evidence, relocating people, assuming debts, validating a marriage that did not exist in the other Paths, or letting a real crime become legally unprovable, and the surviving biography has to hold up under physical and institutional scrutiny. Reality is harder to forge than a passport.

Invite the Hound. Collapse the subject and let the pursuing Hound cut the last tether. This works in roughly the way setting fire to a hospital works as pest control.

Running contradictory history fairly

The entity must never become the GM’s excuse to invalidate whatever the players establish. Write the starting Paths before the investigation begins. Give every Path an anchor and a consequence. Preserve facts once they are established within a Path. Never invent a new Path just to negate a successful action. Say out loud when evidence threatens a specific Path, and let players know when committing a synthesis will drop the track. Let actions aimed at shared invariants work normally. Keep the subject to one action, one HP pool, one WP pool. And make every collapse preserve the moral and physical consequences of the selected history. Contradiction should generate decisions, not arbitrary reversals. No account has been secretly marked true behind the screen; the players are the ones who decide which set of consequences reality keeps.

Scenario operations

All Alibis Confirmed

A political assassin is recorded continuously at a public banquet while also killing the target in a secured residence, and both locations hold strong forensic evidence. The security service wants the contradiction resolved before trial. Every eliminated Path makes the suspect easier to imprison and the angles inside the prison a little wetter. The only survivable history makes a beloved national figure the assassin’s willing accomplice.

The Innocent Path

The Protagonists collapse a serial murder suspect into a Path with an airtight innocent life. The murderer no longer has the scars, the memories, or the trophies. The victims are still dead, their families still remember, and every forensic record now points at a person who physically did not do it. The rejected guilty Path has contaminated the lead investigator, who has started remembering where the bodies are buried.

Witness Protection

An intelligence program used controlled Which-Way procedures to hide operatives from Tindalosian pursuit. A database migration connects aliases that were deliberately kept in incompatible systems, and hundreds of Paths begin collapsing as automated identity resolution builds canonical personnel records. Stopping the software comes too late, because backups, downstream integrations, and human analysts have already learned the associations. The Protagonists have to decide which agents get definite lives before the Hounds arrive.

The Man Who Keeps Surviving

The target has been killed four times and every corpse is authentic. He asks the Protagonists for protection, insisting he experiences each death continuously in his dreams and that only one Path can still support an ordinary life. Unfortunately that Path includes a spouse and child who exist nowhere else, and the evidence needed to stabilize it will eliminate three people whose histories depend on incompatible versions of him.

The Final Alibi

An elderly Which-Way Woman kept five histories running for forty years. Dementia is eating her ability to keep them apart, and relatives from incompatible lives are arriving at the same hospice, each with authentic photographs, legal records, and memories. One history contains no Tindalosian encounter and might let her die naturally. Making it authoritative will leave several descendants causally unsupported. The Hound is waiting for the family to agree on who she was.

Field classification

WHICH-WAY MAN Type: human causal identity distributed across mutually exclusive macroscopic histories Habitat: transit systems, border zones, archives, intelligence networks, cities with fragmented records Diet: human Behaviour: defensive destruction or manipulation of which-history information Reproduction: the condition can be induced through a dangerous angular procedure; it is not biological Primary sign: several individually authentic accounts that become mutually impossible only when compared Containment principle: identify invariants, prevent new records, and decide whether collapse, separation, or continued ambiguity is the least destructive outcome Primary hazard: the investigation selects which crimes, injuries, deaths, and relationships become real

Closing memorandum

Inspector Baines survived the Bernier incident. He spent the next month proving that Martin Vale had boarded the northbound train. The ticket was authentic. The camera clocks were correct. The conductor picked Vale out of a lineup. Fibres from the carriage matched his coat. Baines documented every link, got independent review, and deposited copies in three archives. At 04:12 on the last morning, Vale became one man. The hotel corpse vanished. The dental fragments disappeared from the bridge evidence locker. The archivist’s knife kept its blood, but the DNA no longer matched anyone in the national system. Vale’s wife forgot eleven minutes of her life and went on holding a telephone until neighbours came into the apartment. On the train, Vale took on every injury belonging to the surviving history. He had not been shot, or stabbed, or burned. He was alive. He had the index. He knew where he was going. For a few seconds he looked relieved. Then the dark window beside him reflected a corner that did not exist inside the carriage. Baines had not discovered which train Vale took. He had manufactured the only Vale left for the Hound to kill.

References and rules basis

• Berthold-Georg Englert, “Fringe Visibility and Which-Way Information: An Inequality,” Physical Review Letters 77 (1996): 2154–2157, DOI:10.1103/PhysRevLett.77.2154.
• Marlan O. Scully and Kai Drühl, “Quantum Eraser: A Proposed Photon Correlation Experiment,” Physical Review A 25 (1982): 2208–2213, DOI:10.1103/PhysRevA.25.2208.
• Yoon-Ho Kim et al., “A Delayed ‘Choice’ Quantum Eraser,” Physical Review Letters 84 (2000): 1–5, DOI:10.1103/PhysRevLett.84.1.
• Daniel A. Lidar and K. Birgitta Whaley, “Decoherence-Free Subspaces and Subsystems,” in Irreversible Quantum Dynamics (2003), arXiv:quant-ph/0301032.
• Cthulhu Eternal, “Open Mythos: Entities,” for creature-profile, Armour, SAN, and Lethality conventions: Entities A–K and Entities L–Z.

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