When out shopping with her son, young mum Cathy McDaid bumps into Michael McAllister, the man responsible for killing her brother Terry 20 years ago. Unaware he had been released from prison and is living in the same town, Cathy pays her solicitor a visit and discovers the killer had been released years ago.

Wracked with guilt over her friend's attack, a woman sets about convincing the police it was her brother's killer, but quickly discovers he's been eliminated from their enquiries.