Flora Rheta Schreiber's original book tells the extended story of Sybil Isabel Dorsett, her multiple personalities, her childhood, and her eventual integration. Sybil was not the first diagnosed case of MPD - the book mentions previous cases - but she was the first to be psychoanalyzed rather than simply treated. Schreiber was a friend of Sybil and Dr. Wilbur, and published the book in 1973.