This is one of the best "self-help" books I've ever read. And I've read probably more than I'd like to admit. Legitimately, though, it gives some really helpful language to the parts of yourself that you just can't ignore--the Child, the Protector, and the Adult. It explains what the Child needs, how the Protector reacts when the Child is threatened, and how the Adult needs to work to soothe the child and Protector in order to form lasting trust with oneself and others.
Wall discusses betrayal at great length, and shows how a seemingly minor betrayal, such as an early abandonment can impact an adult's ability to trust years down the road. The book also provides helpful exercises that lead you in discovering your own issues with trusting others and encourage you to determine how those might be playing out in your adult life.