If There Were Demons Then Perhaps There Were Angels: William Peter Blatty's Own Story of The Exorcist is the New York Times bestselling author's memoir on how he came to write his most famous novel and subsequent Academy Award-winning screenplay adaptation.

While a junior at the Jesuitical Georgetown University in Washington D.C. in 1949, Blatty read an article in the Washington Post about the exorcism of a young boy in Maryland. This chronicled ritual served as the inspiration for the book that became a phenomenon, a film, and a franchise.

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