In exchange for helping writer-adventurer Lawrence Colby smuggle 300 watch parts into Paris from Switzerland, Martine Randall asks Colby to help solve a complicated situation involving her friend Sabine Manning, a well-known author of sex novels. Since Sabine is on a cruise in the Aegean Sea with her latest lover, her business manager, Merriman Dudley, had hired ghostwriter Kendall Flanagan to finish Sabine's novel, but Kendall has been kidnaped by gangsters who believe that she is Sabine. Posing as a gangster, Colby arranges to see Kendall before the ransom is paid. Kendall then uses karate to dispose of her abductors, and she and Colby flee to the woods. Colby next discovers that Kendall is wanted by the French police for the murder of a gangster whom Kendall insists was killed by French gunman Pascal Decaux. Kendall and Colby eventually make their way back to Sabine's Paris house to continue work on the novel, but Sabine returns and announces that she will no longer write about sex. Colby and Martine finally convince her, however, to complete the novel under her pen name and write scholarly works under her real name. Decaux suddenly arrives, and Colby knocks him out. In the end, the hoodlums are sent to jail, Kendall leaves for the United States, Sabine returns to the Aegean, and Colby and Martine book seats on a flight to the island of Rhodes.