 When the body of a missing prostitute is found, Rebus is haunted by a case from twenty years before. The killer was never found, but Rebus remained convinced that rich kid Daniel Raeburn was responsible. Now a respectable Edinburgh MSP, Daniel protests his innocence. As Templer and the team close in on prime suspect Martin Cowan, Rebus doggedly pursues Raeburn. In a final twist, Rebus discovers that gut instincts are sometimes open to interpretation.