I really enjoyed this book by John Mannock. It adds to my collection of submarine books and movies. But Iron Coffin brings an interesting twist to the Das Boot-genre of WWII Kriegsmarine lore. The story commences with the discovery of a U-boat wreck in a Louisiana river delta and a chance encounter in a local bar with an old timer who can tell the story for the first and perhaps last time. How the disabled submarine sought refuge in the bayous and sought help from the Cajun river dwellers. And the surprising twist that explains why one of the sailors is left behind. Gritty, authentic detail and the unconventional story line make this a great read.