In Series 6, Tennison is being pressured to retire by her male colleagues. Instead, she takes on a high-profile case, the torture and murder of a young Bosnian refugee. When her prime suspect turns out to be a minor war criminal, Tennison meets resistance from her superiors, struggles with ambitious underlings, and uncovers buried secrets. Her career now at risk, she realizes she has little else left in her life and everything to fight for. Guest stars include Ben Miles (Coupling, The Forsyte Saga), Robert Pugh (Master and Commander), Clare Holman (Lewis), Frank Finlay (The Pianist), and Mark Strong (Sherlock Holmes, Syriana).