Enzo MacLeod, a Scot who is teaching forensics at Cahors in southwest France, thinks that he can use his expertise to crack seven notorious murders described in a book by Parisian journalist Roger Raffin. After solving the first two, Enzo is diagnosed with a terminal illness. And now it appears hes the target of someone intent on destroying his credit and getting him arrested for murder. Establishing a safe house for his loved ones, he sets to work. Are his woes connected to one of Raffins unsolved cases? What further remnants of evidence can he review? Can he stay alive until he catches the long-hidden killer?