Das Boot is an excellent work of fiction.
Convoy by Martin Middlebrook is well done. It describes the Ginormous convoy battle of 1942,involving the HX convoy that overtook the slower SC convoy. What resulted was a running battle between the convoy/escorts and the wolfpack for 10 or more days. Air power from Coastal Command forced Doenitz to pull his boats away, but it was the last major success for the Uboats in the way.
Enigma, by Hugh Sebag-Montefiore is good too. It focuses on the crypto-side of the war, but extensive amounts of the book are devoted to the Allies trying to beat the Uboat threat.
Recently finished 10 Years and 20 Days by Karl Doenitz. Very concise, filled with detail - covers evolving tactics, technology,construction of the different types of boats. Also, writes about his time as Chancellor of Germany after Hitler shot himself. A good read for anyone into the Battle of the Atlantic. He quotes Captain Roskill extensively (to compare against his war-time notes), so I'll have to pick up Roskill's book on the war sometime.
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