Plot summary
Jane and Maura are asked by forensic psychiatrist Dr. Victoria Nolan ( Jessica Tuck ) to speak at a law enforcement symposium. Nolan is on a tour for her book, Three Faces of Evil, which is about serial killers, one of whom is Charles Hoyt ( Michael Massee ). A crime scene depicting Hoyt's murders is staged. As Jane and Maura move to describe the "victims", they see that the forensic dummies are real corpses. The victims, past and present, have been branded with the Rod of Asclepius symbol.
Credits
Adapted from Wikipedia contributors, List of Rizzoli & Isles episodes. HTML formatting and reference markers removed.