While on an airplane, a courier is robbed of a fortune in diamonds. He raises an alarm, not realizing the thief has tossed the briefcase full of gems from the plane to his awaiting accomplice on the ground.
Many years after World War II, two former servicemen have a falling out over the German crown jewels that they stole during the waning days of World War II. One man, a local politician wants to return the gems, but the other wants to sell the diamonds to the highest bidder. With the help of a beautiful but shifty French smuggler, King and Casey attempt to recover the gems before they disappear.