"Based on true events--a child's demonic possession in the 1940s--it is the story of eleven-year-old Regan MacNeil, whose sudden disturbing, and often violent, behavior drive her desperate mother, Chris, a famous actress, to eventually seek help from two Catholic priests, men who will risk everything--including their own souls-- to free the girl from an ancient malevolent force possessing her."--Provided by publisher.

William Peter Blatty (1928–2017) was the bestselling author of The Exorcist, which he turned into an Academy Award–winning screenplay. The son of immigrant parents, he was a comic novelist before embarking on a four-decade career as a successful Hollywood writer. Blatty died on January 12, 2017, in Bethesda, Maryland.