The List by J.A. Konrath (A Technothriller)

Tom Mankowski , Chicago Homicide Dectective Second Class just arrived on the scene of what appears to be a hideous homicide. The victim has been decapitated and the head has rolled under a desk. If that's not enough for you imagine each finger being systematically cut off one at a time. This wasn't your average Joe that was dead. This was Thomas Jessup who worked at the main branch of the Chicago Public Library. As the Medical Examiner and 2 cops begin to lift the body on to a cart the Medical Examiner sees something strange on the bottom of the victims left heel. After a closer look it appears to be the number 7 tattooed on the heel. What does all of this mean? It's the beginning of a coast to coast investigation involving 7 people marked for death.