The Unexpected Guest begins on a foggy night at a lonely country house, where a woman with a gun in her hand is quietly surveying the dead body of her husband. It looks like a straightforward case of murder. Or is it? As the ghosts of an old wrong begin to emerge from the past, the case begins to look...
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.