A mysterious American gets mixed up with gunrunners in Syria.
Enrico Caruso's only passion is to sing. For that, he leaves his hometown of Naples, Italy, and travels to America to sing for the Metropolitan Opera. At first, his lack of education and poor background make him an outcast in the high-class opera world. Eventually, his voice wins him both fans and the hand of his love, Dorothy. But his nonstop pace and desire to perform at any cost eventually take their toll on the singer's health.
Lost Caverns Hotel bellhop Freddie Phillips is suspected of murder. Swami Talpur tries to hypnotize Freddie into confessing, but Freddie is too stupid for the plot to work. Inspector Wellman uses Freddie to get the killer (and it isn't the Swami).
An armored-car guard must join a robbery after being caught with his ex-wife by her gangster husband.