Series 3 · Episode 6
Inheritance
First broadcast 12 July 2009 · 5.14 million viewers
DirectorEdward HallWriterAlan WhitingOriginal order18 of 18Editorial statusOwner reviewed
Fan-reviewedAll 18 episodes watched · editorial review updated 5 September 2026How this guide is researched
The case and opening problem
Peter helps an aristocrat worried about his brother’s drug use while Lyle investigates pollution in a river.
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
Despite continuing blackouts, Peter assists an aristocrat who suspects that his brother is taking drugs, while Lyle investigates pollution in a local river. Medical tests reveal that Peter has diabetes, but they also uncover a more profound family secret: he is not biologically related to Beatrice. Aunt Auriel confirms that Peter and his younger siblings did not share the same father, leaving Peter to question his identity as the series ends.
What this episode changes
Peter is diagnosed with diabetes and discovers that he and his younger siblings did not share the same father.
Why this episode matters
The finale joins bodily diagnosis, polluted water and family evidence: hidden conditions become visible, but explanation does not guarantee closure.
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.