The words are scrawled in blood at the most shocking murder scene Forensic Pathologist Maura Isles and Detective Jane Rizzoli have ever witnessed. The victim, a young woman, has been entirely drained of blood and horrifically dismembered. When there's a second murder, the police uncover a link to a secret society known as the Mephisto Club. Their mission is a terrifying one - to find the true source of evil on earth. But has evil already found them?