A tragic road accident on a bleak moorland road lures PI Jack Scott to the Isle of Mull, and into a web of intrigue stretching back more than thirty years. Only hours after arriving on the island, talks with motor mechanic Jim Gorrie and the elegant sexagenarian Peggy McBride convince Scott that the crash that killed Bridie Button was no accident. But if it was murder, he was once again looking at the perfect crime. Using a derelict bothy as a base, Scott and colleagues Calum Wick and Stan Jones investigate crimes in Mull, Oban and Liverpool, looking for possible links as the death toll mounts. When Scott's close friend Sian Laidlaw is injured in a road accident that seems to mirror Bridie Button's accident, the violence is getting too close for comfort. A solution must be found. Somewhere, a murderer is on the loose.