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The Mysterious Miss X would have the audience believe that the very American Michael Whalen and Chick Chandler are a pair of stranded British vaudevillians named Neville and Casey. Further straining the film's credibility is the notion of our heroes being mistaken for Scotland Yard detectives. Rising to the occasion, Neville and Casey attempt to solve a murder in a backwater Midwestern town. The clues all seem to point to heroine Julie (Mary Hart, aka Lynne Roberts), much to the dismay of Neville, who's developed a crush on the girl. When a second murder occurs, Julie is in the clear, and the "least obvious suspect" (whom the audience tagged in reel one) is captured. A few scattered laughs are provided by radio comedienne Mabel Todd as a well-meaning buttinsky. Mysterious Miss X was directed by former "Our Gang" helmsman Gus Meins.