In 1938 Los Angeles, California, two members of mobster Eddie Valentine's gang steal a rocket pack from Howard Hughes. During their exciting escape, they find themselves in an airfield, where the hide the rocket, but end up in an accident while escaping the airfield. Stunt pilot Cliff Secord, whose plane was damaged in the accident, and airplane mechanic Peevy find the mysterious rocket inside a bi-plane in their employer's hangar, where the getaway driver hid it.