Eight people at a remote Scottish inn find themselves confronted by a woman from Mars, who has landed her flying saucer for repairs but intends to soon conquer the Earth and enslave its men for breeding purposes.
Victor Marswell runs a big game trapping company in Kenya. Eloise Kelly is ditched there, and an immediate attraction happens between them. Then Mr. and Mrs. Nordley show up for their gorilla documenting safari. Mrs. Nordley is not infatuated with her husband any more, and takes a liking to Marswell. The two men and two women have some difficulty arranging these emotions to their mutual satisfaction, but eventually succeed.
Richard Hanney has a rude awakening when a glamorous female spy falls into his bed - with a knife in her back. Having a bit of trouble explaining it all to Scotland Yard, he heads for the hills of Scotland to try to clear his name by locating the spy ring known as The 39 Steps.
Because his father, Lord Grenham, spends more time philandering with attractive women than conducting business, Willie Tatham is forced to interrupt his honeymoon with his wife Margot in the south of France and return to London to get his father to sign an important contract. While Margot, an actress, goes to a small resort where she will not be recognized, Kitty Lake, one of the young women Lord Grenham pursues, flirts with Willie. Two weeks pass and when Willie tells Margot on the telephone that he must stay in town, she threatens to engage in a violent flirtation with the next attractive man she sees. Karl von der Heide, from Vienna, who is waiting to use the telephone, overhears her and begins a flirtation. She identifies herself to him as Mrs. Margaret Spaulding, and they pursue the beginnings of a romance until Margot suddenly returns home.
Because his father, Lord Grenham, spends more time philandering with attractive women than conducting business, Willie Tatham is forced to interrupt his honeymoon with his wife Margot in the south of France and return to London to get his father to sign an important contract. While Margot, an actress, goes to a small resort where she will not be recognized, Kitty Lake, one of the young women Lord Grenham pursues, flirts with Willie. Two weeks pass and when Willie tells Margot on the telephone that he must stay in town, she threatens to engage in a violent flirtation with the next attractive man she sees. Karl von der Heide, from Vienna, who is waiting to use the telephone, overhears her and begins a flirtation. She identifies herself to him as Mrs. Margaret Spaulding, and they pursue the beginnings of a romance until Margot suddenly returns home.
