John “Ludwig” Taylor
James's identical twin; a puzzle setter drawn from solitude into crime solving.
Twin: JamesAlly: LucyUncle: Henry
People of interest
Relationships, roles and guest guides.
A cross-series guide to the family, the police team and notable visitors. Current spoiler setting: Series 2 · Episode 3.
Reviewed guide · Sources & corrections
Knowledge network
The dangerous variable is recognition
Family connection is fixed. Knowledge of the impersonation is not.
JOHNInvestigator
JAMESMissing DCI
LUCYKnows the substitution
HENRYFamily knowledge
POLICEAssumption changes
IDENTICAL TWINS
KNOWS JOHN
SEES “JAMES” → LEARNS JOHN
Identity study
Recognition is the dangerous variable
The paired silhouettes and incomplete shadow visualise the archive’s central distinction: family connection may be fixed, but knowledge of the substitution changes.
Original compositionNo actor likenessesClearly labelled
Core relationships
The Taylor case
James Taylor
Cambridge DCI, Lucy's husband and the missing person at the centre of the long-form mystery.
Twin: JohnSpouse: LucyFather: Henry
Lucy Betts-Taylor
James's wife and John's investigative partner outside the station.
Spouse: JamesAlly: JohnSon: Henry
Henry Betts-Taylor
Lucy and James's son; part of the family story that gives the mystery its stakes.
Parents: Lucy & JamesUncle: John
Major Investigations Team
Cambridge police
DI Russell Carter
John's principal colleague inside the investigative team.
DCS Carol Shaw
Senior command and a key figure in the police hierarchy.
DS Alice Finch
Recurring detective in the MIT ensemble.
DC Simon Evans
Detective constable within the original team.
DC Ethan Cole
A Series 2 addition to the police ensemble.
Series 2 role hidden by your spoiler setting.
DC Caitlin Sullivan
A Series 2 addition to the police ensemble.
Series 2 role hidden by your spoiler setting.
Guest and recurring files
Series 2 arrivals
Episode associations are published only where supported by released credits or official promotion.
Gareth Fisher
A newspaper editor who expands the investigation beyond the police station.
Series 2 description hidden.
Joanne Kemper
A local MP and recurring Series 2 character.
Series 2 description hidden.
Patricia Lowery
Part of the theatre-case guest ensemble.
Episode 1 guest information hidden.
Portia Lowery
Part of the theatre-case guest ensemble.
Episode 1 guest information hidden.
Danny Sloane
A champion snooker player at odds with John in the fourth investigation.
Episode 4 guest information hidden.
No résumé dumping
Profiles focus on the character's place in the case, not copied performer biographies.
People directory
Characters, performers and relationships
Separate the fictional relationship map from the credited company who bring it to screen.
Principal character files
From relationship map to individual record
Each file separates performer, programme scope and verified connections from episode appearances still not yet recorded credit checks.
John TaylorDavid Mitchell · investigatorJames TaylorDavid Mitchell · missing twinLucy Betts-TaylorAnna Maxwell Martin · investigative allyDI Russell CarterDipo Ola · police teamDS Alice FinchIzuka Hoyle · police teamDC Simon EvansGerran Howell · police teamDCS Carol ShawDorothy Atkinson · leadershipHenry Betts-TaylorDylan Hughes · familyDI Matt NevilleKarl Pilkington · detective
Series 2 arrivals
What the new recurring characters change
This is a role guide, not a forecast of guilt or allegiance.
DC Ethan Cole · Ben Ashenden
A new member of the Cambridge police team, placing another investigative voice beside Carter and Sullivan.
DC Caitlin Sullivan · Rumi Sutton
A new detective constable in the returning station ensemble.
Gareth Fisher · Mark Bonnar
The editor at Lucy's local newspaper and a source of pressure in her new working life.
Joanne Kemper · Sian Clifford
A local MP whose public position connects the weekly stories to Cambridge power and reputation.
DCC Clint Radley · Michael Wildman
A senior police figure introduced into the wider institutional story.
Evidence rule
Character descriptions use announced roles and broadcast material only. Publicity language is not treated as evidence of motive.
Big Talk Studios · Series 2 cast and production announcement →
Cast-to-character route
Meet the Series 2 company without losing the story
The people map explains what Ethan Cole, Caitlin Sullivan, Gareth Fisher, Joanne Kemper and Clint Radley change inside the fiction. The cast directory now supplies the separate performer context and verified appearance ledger.