David Nelson pits imagination against Scotland Yard routine when he elects to pursue his own course of investigation on the murder of Willie Strayte. Strayte had gotten the editorship of a new crime magazine promised to Nelson; Nelson learns his wife had been Strayte's mistress, and, doubly suspect, tries to find the link between a 1923 South African killing and the present. His success however commits him to a life he had hoped to leave. A lone wolf hunt in London pressure publishing is persuasive.