Freud's Mistress by Karen Mack and Jennifer Kaufman

Ehh.  This was good.  But I would have liked more details about Freud and what he thought and where it came from.  This book went deep into the mistress's thoughts, etc. which are clearly conjecture and very little into historical events, facts, and reality. 
It is interesting that Freud had a relationship with his sister-in-law.  She lived in their house for 40 years and helped his wife raise her 6 children.  The authors even make the claim that she had an abortion at some point.  However, I kind of hate when books try to re-write or create history for us.