Unless the purpose of the book was only to "out" Katharine Hepburn and Spencer Tracy, and, apparently, everyone else Kate knew, in which it tries very hard to achieve its objective.
I found the book to be difficult to read, and often difficult to believe. So many things didn't add up, and I often found myself thinking "now, how did the author know that?" Mann uses a lot of innuendo, and in order to actually KNOW the things he claims, he would have had to have been in the bedrooms of the people involved.
I read a lot of good reviews before purchasing the book, and can only say I was disappointed. After the first chapter I GOT the idea - Kate was gay or bisexual, at least in the author's opinion - so much paper could have been saved without the rest of the book.
When I was about 10, I was a tomboy. I wanted to be a boy. I buy and wear men's jeans because they fit better. I played with my brothers and their friends, not my sister or "dumb dolls". God only knows where the author could go with that information. When I was older, I had close female friends, and close male friends - with that information, the author could write a similar book about me, I think. Except I've never been sexually attracted to other women, and I'm happily married.
My real problem with the book, aside from the fact that it was not interesting reading, is that I couldn't understand why someone would write a book trying to prove a person was gay or bisexual. It just got tedious after a while.
One can always find "someone" who said "something", and the author did have an agenda. Whether or not Kate was bisexual or gay does not a book make. Speculation about it makes even less of a book.
This was not the definitive bio of Kate that people claimed it was. The author started with a thesis, or opinion, and set out to prove it - to me, not very successfully. Perhaps one day there will be a definitive biography of Hepburn. Possibly her sexuality will be part of it - the small part that it should be when one writes about a life. I look forward to that book.