Scientist Dr Jekyll discovers a way of changing his personality and becoming the violent and aggressive Mr Hyde. At the start, moving from one to the other is easy. But not for long. Both a psychological investigation and a thrilling story, the double nature of the hero has made him an iconic figure in literature.
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.