Rebus investigates when a number of women are killed with the same modus operandi as 'The Preacher', a prolific serial killer active in Edinburgh during the 1980s. But is a copycat killer at large, or has 'The Preacher' returned to finish what he started?

Rebus investigates when an unidentified body is found in the grounds of a local Edinburgh hotel which is due to play host to the World Trade Summit. When another body is found in the grounds of Edinburgh castle, Special Branch intervene and warn Rebus off the case.