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Loved it! Have always been a fan of the movie, and had no idea the author of the book also wrote the screenplay. The book dives deeper into the psychiatry of possible conditions ailing Regan, and then proof/evidence to be granted an exorcism. As the book went on, it was more thrilling and “unputdownable” 😅 Kinderman (the detective) was far more annoying in the book, and father Merrin had thoughtful insights as to why people experience exorcisms.