Jenny Jones is abducted by Zenon Horak, a hit-man, and transported to Paradise Island in the Mediterranean Sea. A ransom of £10m in diamonds is demanded for her return. Ex-mercenaries Mike Randle and Suzie Drake agree to make the exchange.
To surprise the abductors, Mike’s death is faked. Unconvinced, Horak tries to discover the truth and enters their home. Suzie confronts him wearing her kimono, which opens during their fight, stopping Horak momentarily as he stares at her naked body. He recovers and knocks out Suzie before making his escape. Mike begins a car chase after him around a cliff-top road. Catching Horak’s car, he rams it over the cliff edge, but does not see a bloodstained arm emerge from the mangled vehicle.
Horak’s body is not in the wreck, and when the police uncover his hideout, he escapes on a motorbike. He heads down an embankment and enters a railway tunnel. A train enters the far end, and a smashed motorbike and unrecognizable body are flung from the tunnel.
Mike and Suzie sail to Paradise Island intent on foiling the abductors and releasing their captive.