There are 2 books in the Hitler's U-Boat War series. The newest book is The Hunted 1942-1945 which came out in 1999.

1
The Hunters 1939-1942

Book cover of The Hunters 1939-1942
"His monumental work...is the most thorough study of the U-boat campaign available."    --Library Journal

Hitler's U-boat War is an epic sea story about the most arduous and prolonged naval battle in history. For a period of nearly six years, the German U-boat force attempted to blockade and isolate the British…
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2
The Hunted 1942-1945

Book cover of The Hunted 1942-1945
Acclaimed on its publication in 1997 ('should become the standard history of the Unterseeboote' - Washington Post) volume one of Clay Blair's magnum opus is here followed by volume two, The Hunted covering 1942-45. In this volume the fortunes of the German navy are completely reversed - due in no…