Point of Origin (A Scarpetta Novel)
- a cryptic and foreboding letter: "Hey DOC, Tick Tock, Sawed bone and fire,".
- note has been signed by Carrie Grethen, the psychotic killer Kay helped send to a psychiatric facility for going on a murder spree with Temple Gault in Cornwell's earlier book Body Farm.
- 272 Pages - 07/06/1998 (Publication Date) - G. P. Putnam's Sons (Publisher).