The decaying body of a woman is discovered in a suburban house in South Devon, following an anonymous tip off to the police. DI Wesley Peterson has problems establishing the woman's identity and, as he begins to investigate her death, another disturbing case arises. Two teenagers are found shot dead at the foot of a cliff.

The teenage victims had taken part in an online game called Blood Hunt and it seems they may have been persuaded to play a sinister real-life game, which ended in their murder. When a skeleton is found near the place where the teenagers were last seen alive, Wesley must face a terrible truth... and a hunt to the death.