[1] Originally in treatment for social anxiety and memory loss, after extended therapy involving amobarbital and hypnosis interviews, Sybil manifests sixteen personalities.

Wilbur writes that Sybil's multiple personality disorder was a result of the severe physical and sexual abuse she allegedly suffered at the hands of her mother, Hattie.

At the book's end, a new, optimistic self (called "The Blonde") emerges, preceding Sybil's final integration into a single, whole individual with full knowledge of her past and present life.

[3][4] Audiotapes of recorded conversations between Schreiber and Wilbur were examined by Herbert Spiegel and later by academic Robert W. Rieber of John Jay College of Criminal Justice.

[7] Patrick Suraci, author of SYBIL in her own words, personally acquainted with Shirley Mason and still in touch with members of her family, criticizes Spiegel for what he terms unethical behavior in withholding the tapes.

Much of Nathan's book repeats material already covered in the original Sybil, including a 1958 letter in which Mason spoke about making up the "alters" for attention and excitement.

[13] Nathan claims Schreiber became aware of Mason and her alleged past, writing Sybil based on stories coaxed from her during therapy, and that this case created an "industry" of repressed memory.