To his enlisted men on U-154, Lieutenant Oskar Kusch was the ideal skipper--bright, experienced, successful, caring, tolerably eccentric--and a popular captain who always brought his boat home safely when so many others vanished without a trace. To most of his officers Kusch came across as someone very different--a Nazi-hating intellectual with an artistic bent given to lengthy criticisms of the regime, its leaders and its propaganda, a suspected...