DI Owen Sheen vowed to his father never to return to Ireland. But years have passed, and Sheen needs answers to the questions he has surrounding his brother's death. He is on loan from the Met under the belief he will be helping set up a new Historical Offences Team. On arrival to Ireland, plans change and he finds himself partnered with newly promoted DC Aoife McCusker to work on her first appointed murder investigation. John Fryer, an IRA veteran, has recently escaped from a mental asylum. Sheen thinks Fryer was involved in the killing of his brother, and is now after him. But will Sheen be able to put his personal agenda aside?