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.
Four stories move at different speeds
Track the event, the impersonation, Lucy’s investigation and what the audience is allowed to know.

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.
Canon
James Taylor is a Cambridge DCI and John's identical twin. His disappearance triggers Lucy and John's investigation.
Evidence
Every logged clue is tied to an episode, scene or reliable production source wherever the current record allows.
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.