An unprecedented series of violent tornadoes is sweeping across Oklahoma. Tornado chasers, headed by Dr. Jo Harding, attempt to release a groundbreaking device that will allow them to track them and create a more advanced warning system. They are joined by Jo's soon to be ex-husband Bill, a former tornado chaser himself, and his girlfriend Melissa.

Lisbon, early 1940s. The neutral port town is an open door to freedom, for those who are escaping the Nazi occupied France and eastern European countries, and a war field for spies of every description. Lisbon became a cosmopolitan town, where the Duke of Windsor, Primo de Rivera, Pola Negri, Leslie Howard, Walter Schellenberg and Juan Garcia are often together in the luxury hotels and night-clubs. Espionage and crime go hand in hand, despite of, or encouraged by, the Portuguese secret police.