Directed by James Marsh (Project Nim, Man on Wire)
and based on the novel of the same name by journalist Tom Bradby it stars Andrea Riseborough, Clive Owen, Gillian Anderson, Aidan Gillen and Domhnall Gleeson.
It tells the story of Colette McVeigh (Riseborough), a member of the IRA who is apprehended by MI5 after an aborted bombing in London.
She is given a choice: spend 25 years in jail and never see her son grow up or return to Belfast to spy on her brother, leader of the IRA in the city and "the last obstacle to a viable peace process".
Shadow Dancer, which was shot in Dublin and London, will be released in cinemas on August 25.