Having been involved in an affair, we took this book as a guide on 'how we can sort this out' and re-establish our relationship and trust.
The book focusses largely on the different types of affairs, and this would be useful to one partner if they are suspusious. However for us there was little in this section that helped us, as none of the types/examples related to our situation.
There is little advise on how to recover a relationship, ie how to really dig down and resolve why it happened, and how you can prevent it from happening again. We put the book down, having read it together and said - what else can we find to help us?
So I thinks its a useful summary of 'why affairs happen', but do not offer much help in rebuilding relationships.