Barcelona in 1912 is a city still recovering from the dramatic incidents of the so-called 'Tragic Week' when Catalan conscripts bound for the unpopular war in Spanish Morocco had rebelled at the city's dockside against the royalist forces. In the fighting many were killed and afterwards even more were thrown into prison. Including an Englishman, who was later found dead in his cell. The dead man had been a prominent businessman in Gibraltar. So what had he been doing...
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.