This is a short but well-presented history of one of the many U-boats lost during the Second World War. U-297 was one of the unlucky ones: lost on her first patrol (on December 6th, 1944), before it had made any attacks on Allied ships, having no successes to its credit - and no survivors from its sinking.
But the story doesn't end there. Skinner takes us forward to March of 2002 when two divers discovered and identified U-297 lying 280 feet below the surface. The rest of this short book describes the dive on the boat.