The Winter Fortress: The Epic Mission to Sabotage Hitler's Atomic Bomb
This is a well-known tale that suffers nothing in the retelling. Neal Bascomb doesn't revolutionize anything, but he's done a lot of research using the diaries and family members of the saboteurs, so his account has a pleasingly personal feel. Overall it reads, not in a bad way, like one of the better Alastair MacLean novels (complete with MacLean's trademarked Man Versus Nature! scenes). Plus--kudos to Bascomb!--the book has adequate mappage and a cast-of-characters list right up front.
The Winter Fortress would be an especially good read for someone who's not a history maven. I liked it too, but then again I have a high threshold for re-reads and recapitulations.