Closed Circuit is a 2013 political thriller drama film directed by John Crowley and written by Steven Knight, released on August 28, 2013. The film stars Eric Bana, Rebecca Hall, Ciarán Hinds, Jim Broadbent, and Riz Ahmed.

Plot

A bomb planted in a lorry detonates in London's Borough Market killing 120 people. The London police receive an anonymous tip and arrest Farroukh Erdogan, a Turkish immigrant, as the terror cell leader and mastermind of the attack. Two other members of the cell die in the bombing and the fourth is killed by police in a shoot-out during the raid to apprehend him. When Erdogan's defence barrister commits suicide, Martin Rose is appointed by the Attorney General to replace him, joining special advocate Claudia Simmons-Howe. Due to national security concerns, Erdogan's case follows closed material procedures; Claudia represents Erdogan during closed sessions with a judge ruling what evidence is permissible for Martin to use in the open public trial. MI5 Agent Nazrul Sharma is assigned to provide Claudia with the closed material and monitor her activities.