Starting weeks after Hitler declared war on the United States in mid-December 1941 and lasting until the war with Germany was all but over, 73 German U-Boats sustainably attacked New England waters, from Montauk New York to the tip of Nova Scotia at Cape Sable. Fifteen percent of these boats were sunk by Allied counter-attacks, five surrendered in the region, and three were sunk off New England--Block Island, Massachusetts Bay, and off Nantucket...