Series 2 · Episode 5
The Truth Will Set You Free
First broadcast 10 February 2008 · 5.65 million viewers
DirectorEdward HallWriterGuy BurtOriginal order11 of 18Editorial statusOwner reviewed
Fan-reviewedAll 18 episodes watched · editorial review updated 5 September 2026How this guide is researched
The case and opening problem
A Cambridge professor asks Peter and Simon to recover missing scientific research; Lyle handles a father-and-son motor-business dispute.
Themes
Credited guest cast checked so far
Episode-specific guest credits are awaiting an end-credit check.
Reveal the complete plot summary — spoilers
Plot summary
Peter and Simon travel to Cambridge after Peter’s former professor asks them to recover a dead biologist’s missing research, although the professor is concealing part of the story. Left in charge of the practice, Lyle becomes involved in a disagreement between a car dealer and his son, who wants an independent future rather than accepting money that would bind him to the family business.
What this episode changes
Working together exposes the brothers’ different instincts while Simon’s danger remains unresolved.
Why this episode matters
The Cambridge and motor-business plots both explore the cost of knowledge controlled by older authority figures.
Scene log status
The story and credited names above are reviewed. Exact timestamps, music cues and scene-by-scene filming locations remain to be checked directly against a legitimate copy of the episode.