Explore clue methods, crosswords and the puzzle laboratory.
Try the puzzle laboratory →Is there a Ludwig puzzle book?The obsessive, evidence-led fan archive
Ludwig, solved: the unofficial fan guide to BBC One's Ludwig
Episode recaps and endings, the James mystery, every filming location and a free Cambridge walking tour.
Ludwig is set in Cambridge, where John and the police team work; filming uses the real city and stand-ins in Hertfordshire, Windsor and London.
12 episode guides17 character guides19 filming locations
Start here
What brings you to the Casebook?
Choose a spoiler-aware route. You can change course at any time.
Filming locationsWhere was Ludwig filmed?Puzzles and cluesTry the puzzles The James mysteryFollow the James clues
Every filming location from both series, which ones you can visit, and a free walking route through Cambridge.
See every location →Episode guidesCatch up on an episodeFind series guides and episode files with clear spoiler boundaries.
Choose an episode →Trace confirmed evidence, chronology, knowledge and theories.
Follow the evidence →Deep divesExplore the detailsOpen motif, object, identity and production research desks.
Explore the deep dives →Latest news
BritBox, Christmas special and Series 3
17 October 2026 · Programme news
BritBox launch, Christmas special and Series 3
Series 2’s regular North American BritBox release began on 13 October. The viewing guide explains the weekly schedule and Premier early access. A 60-minute Christmas special follows in December, and Series 3 is now in production.
Latest Ludwig news →Featured files
Three investigations worth opening
Start with a case analysis, the filming atlas or a walk through Cambridge.
Featured investigation · S2 E1Two confessions are not automatically two pieces of evidenceTest each account against the theatre’s physical setting before treating agreement as certainty.
Series 2 Episode 1: why two confessions aren't two pieces of evidence →
Cambridge featureStory Cambridge and filming Cambridge are different mapsCompare the fictional city, real landmarks and production stand-ins.
Fictional Cambridge vs filming Cambridge →Self-guided routeWalk through Ludwig’s CambridgeA practical, accessible route through screen locations and city landmarks.
Ludwig walking tour of Cambridge →Essential Ludwig guides
Catch up and follow the long case
Series 1 ending explained
Revisit the finale, the culprit and the James clues with spoilers clearly marked.
Series 2 ending explained
Understand Ziegler’s plan, Kemper’s release and the final James developments.
What happened to James?
Follow every confirmed clue and the strongest theories across both series.
How to watch Ludwig
Find official BBC iPlayer, BritBox and home-media options by territory.
Every Ludwig episode ranked
Compare all twelve cases with spoiler-free reasons, then try the Ludwig quiz.
Last checked 24 October 2026
To see the public Cambridge locations on foot, follow Walk the Cambridge locations.
For the next announced story, see The Christmas special: what we know.
More ways into the series
Compare every Ludwig episode ranked, read short lines from the programme, or try the Ludwig quiz.
How we check: every fact on this page is taken from the BBC, the production companies or named, dated reports. See our sources and method or send a correction.