World War Two is about to begin and a German Naval Officer is going to war. Again. Oskar Keppler, a U-boat veteran of the Great War, takes command of the Type VII submarine U-115. Based on the actual War Diary of a German U-boat at the outset of World War II, this novel presents the U-boat experience from the perspective of those who lived it. Vivid descriptions of life in a diesel-electric powered submarine: day after day of mundane drilling, horrendous smells and ever deteriorating food are punctuated by moments of action, elation, terror and dread. In perhaps the most important single patrol of the first half of the Battle of the Atlantic, a handful of men will change the balance of power, and strategic capabilities of their adversary, for years to come.