After World War II, the Haunebu flying saucer is secretly hidden by the U.S. government. Disassembled and transported to Dayton, Ohio, it is placed under the supervision of George Matthews, who is tasked with developing a fuel capable of powering the mysterious craft.
Years later, Maria Orsic begins stalking Jim Matthews, George and Emma's troubled baby-boomer son. Jim is a Navy corpsman and a conscientious objector to the Vietnam War, and his military career has been devastated by the increasingly hostile anti-war movement.
When Maria intervenes to help Jim, her motives soon become clear. She isn't there simply to save him-she has come to reclaim the last remaining World War II-era Nazi flying saucer.