Elvie McCulloch's sister Sophie has been missing for 57 days. She went out for a run - and never came home. Several young woman in the area have disappeared in similar circumstances, and Elvie's family fears the worst.

As Elvie is driving to her new job late at night, the naked, emaciated body of a young woman crashes from high above onto an oncoming car. Elvie recognises her as Lorna Lennox, who has been missing for weeks. But why was she up there? Where had she been all this time? And why was she running for her life?

Teaming up with retired detective Billy Hopkirk, who has been retained by the mother of one of the missing girls to find her daughter, Elvie determines to find out the truth. But as the pair alternately collaborate with and infuriate investigating police detectives Anderson and Costello, they find themselves up against a terrifying enemy. Someone who has killed before. Someone who will kill again, for pure enjoyment. Someone they call The Night Hunter.