Ian McEwan, Anchor Books, 1999.

Disturbing and compelling, the better parts of this story take place inside the head of a very young British agent in post-war Berlin. The surrounding story (dealing with the historical events and cloak-and-dagger logistics of Project Gold) is interesting, but the real fascination is watching our protagonist make the mistakes of youth, and then much more serious mistakes. As suggested by the title, we delve into innocence in all its meanings, as well as what happens as innocence meets up with experience and evil.