Only seven U.S. submariners earned the Medal of Honour in World War II. Sam Dealey, the USS Harder's commander, was one of them. His honour was awarded posthumously after the entire crew was lost off Bataan during a depth-charge attack in August 1944. Drawing on previously untapped sources, Michael Sturma details several daring missions, one that involved the heroic Australian commando Bill Jinkins, and puts the USS Harder's action in the context of the overall Pacific campaign.