Line of Duty: Series 1. British police drama at its very best. This taught, tight, hard-hitting acclaimed thriller follows Detective Sergeant Steve Arnott, played to perfection by Martin Compston, as he is plunged into a dangerous, nightmare world when a bureaucratic cover-up ensues after a botched counterterrorism plot. Riddled with crafty criminals and corrupt cops all portrayed by an outstanding ensemble cast that includes Lennie James, Gina McKee, Vicky McClure and Kate Ashfield. Bonus interview clips with the writer, directors and cast members.