During the Christmas holidays, people are supposed to rest, have fun, and believe in good fairy tales. That’s what detectives Jane Rizzoli and pathologist Maura Isles thought—until, on the eve of the bright holiday, they encountered the most frightening and incredible case of their careers. They will have to decipher Latin inscriptions and satanic symbols, dive into history and ancient texts, and also penetrate the very heart of evil and meet a sophisticated killer-predator who has only just begun his hunt…