Before leaving his post, John Stafford must complete an investigation into corruption in the Met. ACC Anne Stewart, keen for promotion to Stafford's old position, finds herself torn when a gunman unleashes terror in Burthorpe; she deals with the danger as a priority, and is late for the all-important interview. Meanwhile, Stafford meets prime contender Alan Cade.

• Tim Pigott-Smith
• Martin Shaw
• Michael Cochrane