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 Detecitve Jane Rizzoli, who swiftly link the victim to controversial celebrity psychiatrist Joyce O'Donnell - Jane's professional nemesis and member of a sinister cabal called the Mephisto Club. On tony Beacon Hill, the club's acolytes devote themselves to the analysis of evil: Can it be explained by science? Does it have a physical presence? Do demons walk the earth? Drawing on a wealth of historical data and mysterious religious symbolism, the Mephisto scholars aim to prove a startling theory: that Satan himself exists among us. With the grisly appearance of a corpse on their doorstep, it's clear that someone - or something- is indeed prowling the city. Soon, members of the club begin to fear the very subject of their study. Could this maniacal killer be one of their own - or have they inadvertantly summond an evil entity from the darkness? Develing deep into the most baffling and unusual case of their careers, Maura and Jane embark on a terrifying journey to the very heart of evil, where they encounter a malevolent for more dangerous than any they have ever faced...one whose work is just beginning.
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