Sybil

This book by Flora Rheta Schreiber chronicles the treatment of a woman with multiple personality disorder & is the classic book that the movie was based on. Recommended for readers interested in mental illness and for people who read books that feature a main character (real or fictional) with massive problems who may or may not come out on top in the end (e.g. A Child Called It, etc., Go Ask Alice, etc...). It's long, but worth it for those readers.