In Southern Spain with a U.S. team, skydiver Fathom Harvill is approached by a Scottish colonel working for a top-secret Western agency. He's after a vital lost atomic device, and wants her to parachute into a house occupied by some Red Chinese agents to help get the thing back. Apart from all this there is a predatory continental doctor on his yacht to take account of. Fathom soon realizes nothing is what it seems to be, but can she fathom the truth out?
Anthony Franciosa, Raquel Welch, Ronald Fraser, Richard Briers, Elizabeth Ercy, Ann Lancaster, Tutte Lemkow, Reg Lye, Clive Revill