Ep 7: The squad find themselves under investigation when a drug dealer, Billy Kemble, is brought in for questioning but later dies in his police cell. While Gene is reluctant to investigate, Sam convinces him that it has to be looked into or trust in the police could plummet. But as Sam tries to figure out who could want Kemble dead, he has to come to terms with the fact that it could even be one of their own who is responsible for Kemble's death... Starring john Simm, Philip Glenister, Liz White, Dean Andrews, Marshall Lancaster, Noreen Kershaw, Andrew Marshall, Kevin Knapman, Andrew Vincent, Sagar Arya, Tom Lloyd-Roberts, Lisa Millett, William Hoyland, Nicholas Blane and Allan Gentleman.