Society believes the worst of Justin Alastair, the notorious Duke of Avon who is clearly proud of his Sobriquet, Satanas. It is he who buys Leon body and soul from a scoundrel in a Paris backstreet.
The first message sent to Tom Thorne's phone was just a picture - the blurred image of a man's face, but Thorne had seen enough dead bodies to know that the man was no longer alive. But who was he? Who sent the photograph? And why? While the technical experts attempt to trace the sender, Thorne searches the bulletins for a reported death that matches the photograph. Then another picture arrives.