"Dr. Dylan Reinhart wrote the book on criminal behavior. Literally -- he's a renowned, bestselling Ivy League expert on the subject. When a copy of his book turns up at a gruesome murder scene -- along with a threatening message from the killer -- it looks like someone has been taking notes. Elizabeth Needham is the headstrong and brilliant NYPD Detective in charge of the case who recruits Dylan to help investigate another souvenir left at the scene...