When Major Len Miller is found dead at the bottom of his stairs, a bloody fingerprint implicates his grandson; as David and Vivienne shed light on a dark secret from the major's past, they also must deal with the fallout from their indiscretion.

A delivery driver is killed, and a trace of his movements places him at a pub that his wife frequents; she has a motive, but she's an alcoholic and can't remember if she killed him or not; when David doesn't turn up for work, Vivienne confronts him.