Genealogist Nigel Barnes is brought into a police search for a serial killer who is scratching a serial number on his victims and dismembering each of them in a unique way. The murders echo a series of killings more than 100 years ago and Nigel must trace the links between the victims then and the victims now. Paperback , 304 pages Published September 23rd 2008 by Penguin UK (first published 2007)