The Tizard Mission, named for its leader Sir Henry Tizard, steamed across the Atlantic carrying a suitcase-sized metal deed box. Designed to sink in the event the ship was torpedoed by a U-boat, the box contained details of the Whittle jet engine, research for an atomic bomb, and a precious cavity magnetron. The Americans proved to be astonished, receptive, and efficient: Bell Telephone produced the first thirty magnetrons in October 1940, and over a million by the end of the war. With this device, both warships and aircraft could carry war-winning radar. But Britain did not only give America military secrets, these same technologies would produce a fortune for postwar commercial industries, with the magnetron being the key component to the microwave oven. In , Stephen Phelps reveals how the Tizard Mission was the turning point in the technological war, giving Britain the weapons it desperately needed and laying the groundwork for both the Special Relationship and much of the United States’s postwar economic boom, an effect that still resonates today.