The seventh Simon Serrailler crime novel. How do you find a killer who doesn't exist? One snowy night, an old lady is murdered - dragged from her bed and strangled with a length of flex. DCS Simon Serrailler and his team are aware of bizarre circumstances surrounding her death - but they keep some of these details secret, while they desperately search for a match. All they know is that the killer will strike again, and will once more leave the same tell-tale signature.