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From the author of The Surgeon and The Deathly Hallows

Rizzoli and Isles are back in the thick of the terrifying events

This Christmas was supposed to be a miracle. But it turned into a nightmare. Jane Rizzoli sees her parents' long-standing marriage crumble before her eyes, and her friend Maura confesses to a sinful relationship with a priest. One by one, gruesome murders, similar to ritual sacrifices, take place. Shocked, Detective Rizzoli begins her usual job: finding the killer. The investigation leads Jane to the mysterious Mephisto Foundation, whose members are convinced that these murders are the work of a demon that walks among people. What is true in their words and what is fiction? What is the director of the foundation, Anthony Sansone, hiding? And does his organisation really want to help, or is it just leading the police astray? There are so many questions. Meanwhile, the killer is ready to strike again...