On May 19, 1942, a U-boat in the Gulf of Mexico stalked its prey fifty miles from New Orleans. Captained by twenty nine-year-old Iron Cross and King's Cross recipient Erich Wurdemann, the submarine set its sights on the freighter Heredia with sixty-two souls on board. Most aboard were merchant seamen, but there were also a handful of civilians, including the Downs family: Ray and Ina, and their two children, eight-year-old Sonny and eleven-year-old...