A killer who runs rings around the police. A detective who is out of control. Meet DSI Wilde. Wilde by name. Wild by nature. DSI Billie Wilde is on a mission to catch the killer responsible for a horrific showcase of murders, in order to prove that she's still at the top of her game. But when hidden skeletons come out of dark corners, she is forced to confront her past and face the truth - that she is the ultimate target, now firmly in the executioner's sights. As Billie grapples with her past, and learns she isn't who she thought she was, she uncovers devastating childhood links to each of the victims. The past refuses to stay buried and Billie soon finds herself wondering if she knows who's behind the brutal murders. But can Billie solve the case and unravel the mystery of her own past before it's too late?

DSI Billie Wilde is back at work after a shocking case that saw her life thrown into utter turmoil. But Billie isn't only Wilde by name and refuses to let the past drag her down. When a teenage girl is killed, her body discovered on train tracks, Billie sets about focusing all her attention on finding out who is responsible and why. As Billie and the police find a link between the girl's murder and a County Lines gang, the case takes a sinister turn. Someone has been using children to peddle drugs. Someone who will stop at nothing to get what they want. Someone who is closer to home than Billie can possibly imagine...