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Hilda Nordstrom (Anita Stewart) works for the Secret Service, while her twin sister Berta (also played by Stewart) leads a more wayward life. Berta -- the "Yellow Typhoon" of the title -- first marries Robert Hallowell, a wealthy young naval engineer (Donald MacDonald), and leaves him after she has run through all of his money. Then she goes from running a gambling house in the Orient to linking up with Karl Lysgaard (Joseph Kilgour). Next, in Manila, she runs into her former husband, who is working on plans for a new submarine. Lysgaard wants to get his hands on them, and he encourages Berta to cozy up to Hallowell. By now, Hilda is on her sister's case and tries to trap her. But Berta kills Hallowell, and she and Lysgaard head for New York, still in search of the plans, which are now held by John Mathison (Ward Crane). Hilda follows, but before she can capture them, Lysgaard kills Berta and then himself. Hilda winds up romantically linked with Mathison. This picture was based on a novel by Howard MacGrath which originally appeared in the Saturday Evening Post.