Two nuns are brutally attacked within the walls of their convent.
There seems to be no shred of motive. But during the autopsy
Forensic Pathologist Maura Isles discovers something entirely
unexpected. And when a second, heavily mutilated body is found and
linked to the case, she and Detective Jane Rizzoli find themselves
in the midst of a terrifying investigation that seems to implicate
everyone. Because who can really say they’re free from sin?