Prudence, a young society woman and aviatrix, is forbidden to continue flying by her fiancé Hewitt and her father. In defiance, she stages her own kidnapping, but Hewitt discovers the ruse and arranges a real abduction to teach her a lesson. His plan backfires, and the kidnappers rob him and capture Prudence. In order to save herself, Prudence pretends to join the gang.
Elderly Spanish nobleman Don Julian is happily married to Teodora, a beautiful young girl, when his protégé, young poet Ernesto, comes to live with them. Vicious gossip spreads false rumors of a love affair between the two young people and the evil Don Alvarez, the most bitter slanderer of all, goads Ernesto into challenging him to a duel. Don Julian, realizing that the youth is no match for one of the best swordsmen in Spain, forces the slanderer into a fight in which Don Alvarez is slain and Don Julian gravely wounded. Ernesto calls upon the dying Don Julian to convince him of his wife's innocence. Misled by his brother Severo, Don Julian believes the youth has come to visit Teodora, denouncing them both before dying, ironically driving Ernesto and Teodora from the house to face the world together.
Gail Ellis, a secretary, accompanies Professor Silas Griswold and his wife to China on an expedition to acquire antique vases. Curiosity draws her to the Shanghai slums where, unknown to Gail, her driver is participating in a scheme to abduct her. Gail escapes, but in the process is accosted by drunken sailors. Luckily, Rupert O'Dare, a young Englishman, is nearby and rescues Gail. He escorts her back to the hotel where he discloses his identity as a British secret service agent and proceeds to arrest the Griswolds for smuggling opium in antique vases. Gail then reveals herself as a member of the United States Secret Service and the two agents fall in love.
