"What is the book that changed your life? (not novels or religious texts)"
I think it's a wonderful way to connect in a less superficial way and learn a little more about each other. It's also a wonderful way to discover new books worth reading.
This is one of them:
They Thought They Were Free: The Germans, 1933-45
Milton Sanford Mayer
Interviews with ten former Nazis comprise the core of this penetrating study of the psychological causes of Nazism and their implications for modern Germany.