Fathom Harvill, a beautiful skydiver, is in Spain with a U.S. parachute team. She is abducted by a man called Timothy and taken to see Douglas Campbell, who says he is a Scottish agent working for NATO and wants Fathom to help him find a triggering mechanism for a nuclear weapon that has gone missing in the Mediterranean.
The device is hidden inside a figurine known as the Fire Dragon. In hot pursuit of it is an Armenian man named Serapkin who is working on behalf of Communist Chinese interests. Fathom skydives into the villa of a second man, Peter Merriwether, who has a trusted Chinese assistant Jo-May Soon, and is also searching for the figurine.
Fathom discovers that the Fire Dragon was stolen from a Far East museum by a Korean War deserter who is now being tracked by a private investigator. Campbell is one and Merriwether the other, but Fathom needs to find out for certain which is which.
After fending off a Serapkin knife attack and another from a harpoon, Fathom finds the figurine in a makeup case. She concludes that Campbell is the trustworthy one and boards a plane with Timothy and him, who promptly attempt to toss her from it. Merriwether arrives in another plane. In the confusion the bad guys fall out of the plane and Fathom decides she's not cut out for a life of crime.
Directed by Leslie H. Martinson
Produced by John Kohn
Screenplay by Lorenzo Semple Jr.
Based on Fathom Heavensent (unpublished novel) by Larry Forrester
Starring Raquel Welch
Anthony Franciosa
Ronald Fraser
Music by John Dankworth
Cinematography Douglas Slocombe
Edited by Max Benedict