4.0

This read like a thriller novel but it's nonfiction. In the first scene: a boat explosion, our hero shoots a Nazi, and then manages to hide on a tiny island before swimming to another - in March in the farthest reaches of Norway. And the action and tension doesn't stop as dozens of Norwegians risk their lives to help their countryman.
If you like escape/pursuit stories, or WWII individual adventure stories, this is your next book.