As somebody who read Sybil in high school and taped the TV movie when it played in the middle of the night, this book was fascinating. It's "the true story" what Sybil, though one of the things the book can't help to suggest is that it's hard to really understand what story is true.

Sybil was the project of three women who all had reasons to lie in their lives: the religiously repressed Shirley who lived in her head, the overly-ambitious psychiatrist who did tests until she got the answer she wanted and the freelance writer who'd learned how to blur the line between fact and fiction for a good narrative.

It's both fascinating and infuriating, and a great lesson in just how people can believe what they want to believe, and play into what other people want.