Detective Inspector Avison Fluke is a man on the edge. He has committed a crime to get back to work, concealed a debilitating illness, and is about to be made homeless. Just as he thinks things can't get any worse, the body of a young woman is found buried on a wet, Cumbrian building site. Shot once in the back of the head, execution style, it is a cold, calculated murder. When the post-mortem reveals she has gone to significant expense in disguising her appearance, and the only clue to her identity is a strange series of numbers, Fluke knows this is no ordinary murder.