Meet Detective Inspector Andy Gilchrist as he races against time to stop a serial killer.

Six bodies have been found in the cobbled streets of St Andrews - all known spouse abusers, each murdered in the same gruesome way: stabbed through the left eye. But with no leads left to pursue and public pressure mounting, Gilchrist is forced off the case.

Why the left eye? How does a photograph of an injured cat link the past to the present?

With his career on the line, Gilchrist is determined to catch the killer alone. But as he digs deeper, he begins to fear he is up against the deadliest kind of killer — a psychopath on the brink of mental collapse.