Evidence board

The James GUIDES

The central mystery deserves its own chronology. This evidence-led file avoids publishing unverified endgame details. Readers can set a spoiler level by episode from the spoiler policy page.

Reviewed 6 September 2026 · Sources & corrections
Parallel chronology

Four stories move at different speeds

Track the event, the impersonation, Lucy’s investigation and what the audience is allowed to know.

Archive desks, coded notes and red thread forming a long mystery trail
Original fan artworkUnofficial archive commissionAI-assisted original fan artwork · not programme material
Long-case panorama

The trail changes shape as knowledge changes

The empty desk, coded notes and connected files give the chronology an atmospheric layer while the ledger retains factual control.

Confirmed

Canon

James Taylor is a Cambridge DCI and John's identical twin. His disappearance triggers Lucy and John's investigation.

Working method

Evidence

Every logged clue is tied to an episode, scene or reliable production source wherever the current record allows.

Clearly labelled

Theory

Speculation will live in a separate layer so readers can enjoy theories without having them presented as programme fact.

James disappears

Lucy is left with questions about James's disappearance and turns to the one person who can convincingly pass for him: his twin.

John enters James's police life

The impersonation begins as a route to information, then immediately becomes entangled with real case work.

Two investigations run in parallel

John solves weekly murders inside the station while Lucy pursues the larger mystery outside it.

The impersonation reaches crisis point

The finale changes the terms of John's relationship with the police world and pushes the missing-James story forward.

John returns in an official role

John's involvement in crime solving is no longer dependent on pretending to be James, but the missing-twin mystery continues.

Spoiler gate

The full evidence chain belongs behind a strict spoiler control. It remains quarantined until a dedicated verification pass is complete.

Series 3 commissioned

Six more hour-long episodes were commissioned before Series 2 aired, giving the long-form mystery room to continue.

Casebook index

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