Find anything in the casebook.
Search across cases, characters, puzzles, locations, evidence and production records. Your saved spoiler level is Series 2 · Episode 3.
Four ways into the archive
The site works best as a set of investigations, not a linear reading assignment.
Choose the desk that matches your question
Episodes, the James mystery, people and Cambridge each have a distinct working surface, joined by one evidence-led method.
Series 1 case guides
Six investigations and the original impersonation arc.
CaseSeries 2 tracker
Available investigations, previews and verification state.
PeopleThe Taylor family
John, James, Lucy and Henry.
PeopleCambridge police
The MIT, senior command and new detectives.
PeopleGuest cast directory
Episode-linked visitors, suspects and witnesses.
PuzzlePuzzle Room
Futoshiki, ciphers, geometry and real puzzle consultancy.
PuzzleGuardian crossword index
Eighteen verified playable Ludwig puzzles.
PlaceLocation atlas
Story setting versus actual filming location.
PlaceCambridge walk
Six central stops and stand-in locations.
EvidenceJames Sources
Canon, traceable observations and open questions.
EvidenceJames chronology
The missing-twin story in sequence.
ProductionProduction GUIDES
Commissions, directors, audience figures and awards.
ProductionCasting Watch
Verified notices, safety guidance and rumour control.
ProductionSource ledger
Official, secondary and unverified research sources.