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Mary Ellis, Paramount's answer to Columbia's Grace Moore, stars in the title role in this musical melodrama/whodunit. When her fiancé dies under mysterious circumstances, neophyte opera diva Mary Stuart (Ellis) flees to South America, assumes a new identity, and obtains a position with a local opera company. Although promising her new boss, Glinka (Guy Bates Post), to concentrate wholly on her art, Mary, now Maria, spends most of her energy rebuffing several lovesick gentlemen, including Philip Roberts (Norman Foster), whose uptight brother, David (Walter Pidgeon), at first dismisses her as a sordid femme fatale. Another marriage proposal leads to another murder and David finally begins to see a connection. While not fending off would-be suitors, Mary Ellis performs selections from the operas Isabelle and Bad Masque.