"How Should We Then Live" (Francis Schaeffer)(audio) - This book really surprised me.
First, the title made me think that it would be on orthopraxy (right living). It is actually a short survey of history from the Fall of Rome to "modern" day (1976).
Second, Schaeffer always struck me as somewhat liberal. But his analysis is strictly orthodox.
Third, I was surprised how succinct he was, and how accurately he could sense the flow of the spirit of the age (and predict what would come over the next 38 years).
This is a book I will need to go over again...