Can intrusive thoughts really lead to murder?

The pressure is building on McQueen.

With a client who may be guilty of stealing millions from the mob and another who believes her partner is being sucked into a dangerous cult, the forensic psychologist turned private detective can't afford any slip-ups this time.

But has the seasoned investigator finally lost his grip and allowed himself to be side-tracked by Zach Lindley and his internet conspiracy theories? And has he left his assistant, Sekalyia, in the firing line?

In the historic streets of York, McQueen faces the frustrations of a faltering investigation and the anger of a distressed client while he wrestles with his own guilt over tragic mistakes he may have made in the past, and the devastation they left behind.