In Southern Spain with a U.S. team, skydiver 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. soon realizes nothing is what it seems to be, but can she fathom the truth out?
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