There's a killer on the loose in the Lake District, and the calm of an English summer is shattered. For newly qualified crime-scene investigator, Grace McColl, it's both the start of a nightmare and the chance to prove herself after a mistake that cost a life. For Detective Constable Nick Weston, recently transferred from London, it's an opportunity to recover his nerve after a disastrous undercover operation that left him for dead. And for a lonely, loveless teenage girl, Edith, it's the start of a twisted fantasy - one she never dreamed might come true.