The Zookeeper's Wife: A War Story - Diane Ackerman
Very well researched, this book tells the true story of a husband and wife who rescue Jews in Poland while dealing with losses of their own. Set during the Holocaust, the story is gripping despite the fact that the author does tend to digress and go into too many details that aren't necessary to advance the main story line. It's worth reading at any rate, and I would consider reading more by this author.