It is 1969, and approximately six months since the shootings in the cathedral. Gently is taken by surprise when he learns of Bacchus's resignation, realising that his sergeant has lost his confidence. Still suffering his own scars from the incident, Gently sets about fixing Bacchus and insists that he help him investigate a death in custody - a case that has both Gently and Bacchus questioning what it means to be a police officer at a time when attitudes to the police are changing. Meanwhile, the victim's family ask the pertinent question: 'aren't the police supposed to protect us?'.