David Braun's toubles begin when he's called to investigate an unusually violent break-in, which leaves two criminals dead and a crime scene that raises more questions than it answers. A meeting witht the building's sinisster owner only adds to the mystery. Braun turns to American academic Susan Milton, from the London School of Antiquities, to help him make sense of the situation. Risking their lives, they expose a horrifying secret that's centuries old - but the discovery makes them the target of a ruthless killer the police just can't catch. With time running out, David and Susan race to uncover the killer's true objective even as he closes in on them...