The Latin phrase is scrawled in blood at the scene of a young woman's brutal murder: "I have sinned." It's a chilling Christmas greeting for Boston medical examiner Maura Isles and Detective Jane Rizzoli, who swiftly link the victim to the sinister Mephisto Club, a cult of scholars who aim to prove that Satan himself exists among us. Then, with the grisly appearance of another corpse, it's clear that someone or something is indeed prowling the city. Soon the members of the club begin to fear the very subject of their study. Could the maniacal killer be one of their own?

Well written. Gerritsen knows how to put a story together. I would definitely recommend this thriller.