From Lee Child: "We all know that Lyle is smart, but who knew he was so funny?"

Can Jake Longly and Nicole Jamison still find humor in the darkest of cases? Jake and Nicole have been hired by confessed serial killer Billy Wayne Baker to prove his innocence in two of his seven murders. However, his DNA turned up at all scenes. Is Billy Wayne simply trying to tweak the system or is someone else getting away with murder? If so, who, why, and how?