When Naomi Jenkins's secret lover vanishes, she knows that he must have come to harm. But the police are not convinced, particularly when Robert's wife insists that he is not missing. In desperation, Naomi realises that if she can't persuade the police that he's in danger, perhaps she can convince them that he is a danger to others. That way they'll find him - and fast.
After all, she knows how to describe the acts of a psychopath in detail. All she needs to do is dig up her own troubled past . . .