Clive Owen and Andrea Riseborough star in this drama directed by James Marsh (MAN ON WIRE, PROJECT NIM), and centering on the internal conflict experienced by an IRA revolutionary who is forced to become a double agent for British intelligence. As young girl growing up in a family of Republicans, Belfast native Colette McVeigh (Riseborough) was devastated when he brother was killed back in the 1970s. As a result of the tragedy, her family joined the insurgency, and Colette became an active member of the IRA. Twenty years later Colette has a son of her own, and continues the struggle alongside her two remaining brothers. Her life is changed forever when she is apprehended by MI5 agent Mac (Owen) following a failed bombing attempt in London, and then offered the opportunity to avoid prison time by becoming an informant to the British government. Upon returning to Belfast, Colette experience an intense crisis of conscience while attempting to fulfill her duties as a mole. Meanwhile, her friends and family seem to grow apprehensive in her presence, and Mac finds it increasingly difficult to ensure her safety. Now it's only a matter of time before the truth comes out, and Colette's fragile construction of lies come crashing down all around her.