Ex-FBI profiler Terry McCaleb called his old job of hunting down serial killers 'blood work'. Nowadays the only blood work he cares about is for his heart transplant. Eight weeks ago he was dead; now someone else's heart keeps him alive.

Then Terry is informed that the anonymous donor of his heart was a murder victim and remains the focus of a stalled police investigation. Unable to ignore evil, even if it means risking his new life, McCaleb is inexorably drawn to help close the case.

But someone is watching his every move-someone who has killed before and will kill again . . .