I wouldn't worry too much about that book about Sybil being false after people actually read the book a lot of people just called her (Debbie Nathan) an attention seeker with her book. She has no validity to her story. She doesn't even have have a psych degree in anyway, whatsoever. I never read Debbie Nathan's actual book, but on her Youtube video she says, "Particularly when it involves women, science needs to be taken with a grain of salt." Just that sentence alone makes her entire argument invalid.