A young boy's body is found in a meadow beside the River Mersey. No DNA. No witnesses. No clues. It brings back painful memories of the Moors Murderers. After two weeks, the police have made no progress finding the killer. The one thing they do know; he will kill again. It is a race against time and they are losing. DI Thomas Ridpath has just returned to work. Diagnosed with PTSD and undergoing supervised psychological therapy, he is dragged into the case against his better judgement. When another murder in Liverpool ups the ante, Ridpath must confront his own demons to stop a child killer before he strikes again.