Sylvia West is a young poetess engaged to Frederic Summers, an eccentric millionaire. Summers, a man who always fears he is being loved for his money, decides to make a small check on his prospective bride. The results of this check completely shock him. Not one fact matches `his` Sylvia. Intregued and bewildered, Summers hires detective Alan Maklin and has him make a thorough investigation on `Who Is Sylvia.`