C.B. Strike: Troubled Blood, Part 4

A mysterious season premiere. Strike is approached by a woman asking for help finding her mother who went missing in 1974.

The investigation takes a dangerous turn as a disturbing piece of evidence leads Robin and Strike into London's underworld. Robin risks her life by pursuing a vicious suspect.

Spurred on by the father of a young woman who also went missing in the 1970s, the detectives attempt to outwit an incarcerated serial killer who may hold the key to the case.

An explosive season finale. Strike realises that Margot's killer is responsible for many other murders that have gone undetected, and lays a trap.