Thriller starring Clive Owen and Angela Riseborough, adapted by Tom Bradby from his own novel. Belfast native Colette McVeigh (Riseborough) comes from a family of well-known IRA sympathisers. After being arrested on suspicion of carrying a bomb on the London Underground, she is questioned by MI5 operative Mac (Owen), and told that if she does not co-operate with the authorities her young son will be taken from her. As Colette reluctantly takes on the role of informant for the British secret services, Mac tries to use her as a means of breaking the cycle of violence in 1990s Belfast.