Debbie Nathan’s “Sybil Exposed” is about psychiatric fads, outrageous therapeutic malpractice, thwarted ambition run amok, and several other subjects, but above all, it is a book about a book. Specifically, that book is “Sybil,” purportedly the true story of a woman with 16 personalities. First published in 1973, “Sybil” remains in print after selling over 6 million copies in the U.S. alone.
