When Tommy Davidson is found with his throat cut, his brother Andrew's shock turns to thoughts of vigilante retribution. Known villains, including the person indirectly responsible for the death, begin to disappear. Thanks to the efforts of one of Cairnburgh's cleverest lawyers, each has managed to evade justice. But not any more. Meantime, rape victim Rhona Kirk starts a new life in Dundee but finds it difficult to shake off her past. As DCI Jack Carston tries to find what links the various missing persons, he's aware of his own darker impulses and of an empathy between himself and the vigilante. His investigation becomes a race against time and against the pressure of darkness.