After a traumatic car accident wipes out his memory, Matt Barron retreats to his sister's house in rural Wales to begin his slow recovery. But something's wrong. He keeps having a recurring dream of being in a house with a group of dead bodies and a bloody knife in his hand, and he's beginning to have real doubts that he is who his sister says he is. Then one night, the past comes calling in the most terrifying way imaginable, and Matt is forced to flee for his life. He needs to find out who he is, whatever the cost, and there's only one person who can help: ex Met cop turned private detective, Tina Boyd. But Matt's a hunted man and, as Tina digs into his background, she suddenly finds herself in the firing line, too.