Superstar matinee idol and singer Mario Lanza stars along with Joan Fontaine and Vincent Price in this musical melodrama about a singer who is torn between the love of two women and his own ambition. After a wealthy but fickle woman (Fontaine) discovers a vineyard worker with a beautiful operatic singing voice, she helps make him a star. But when she breaks his heart, causing him to botch his audition for the Metropolitan Opera, he flees to Mexico, where he falls in love with a sweet farm girl. Just when it looks like he will find happiness, his conniving former benefactor tracks him down. In addition to singing numerous selections from popular operas, Lanza performs a pair of Sammy Cahn/Nicholas Brodszky pop tunes, "Serenade" and "My Destiny."