Prime Suspect 5: Errors of Judgement (1996)

Superintendent Jane Tennison (Dame Helen Mirren), on a new beat, investigates the killing of a drug runner, with the runner's employer, "The Street" (Steven Mackintosh), as her prime suspect. Meanwhile, The Street is conducting his own investigation into the killing, with the help of his team of hoodlums and his vicious Rottweilers. And as Tennison rankles that her subordinates accuse her of sleeping her way to the top, she begins an affair with her married supervisor.