I'll give the Reader's Digest version a shot.
In Session is a book written about how the client experiences therapy from the client's point of view. The author surveyed several hundred women who had done varying lengths of therapy and different types who were willing to talk about their experiences. Based on the surveys, she went on to do in-depth interviews and used some of theri stories in the book as well as interviewing therapists to get their point of view about what the clients were saying.
It's one of the few books that addresses how common transference is, including erotic transference, how it should be responsibly handled by a therapist, and what happens when it isn't. For anyone experiencing intense transference with a T it's almost a "must read" because it really helps you realize that it's a pretty normal reaction and you're not alone.
I know several women who have given it to their therapist to read. For me reading helped me to make sense out of what was going on with all the intense emotions and even highlighted a couple of issues for me. On the upside, I decided not to give it to my T because he was already doing it right, so it served as a confirmation that I had found a good T.
Hope that helps!
AG