On a busy train station platform, a man pulls a knife and viciously attacks another passenger before fleeing - apparently unaware of what he has just done.

To the police, it looks like a terrorist attack. But Forensic Psychologist Dr Jo McCready has seen this bizarre behaviour before, in controversial psychological experiments. She knows this is no random killing spree.

When a botched cold case resurfaces, and the mistress of a controversial billionaire philanthropist is found dead, Jo discovers all these crimes are tangled up in the same web of deadly local secrets. Secrets that some will kill to protect . . .