Andy Simpson, constable, blacksmith and all-round mechanic of Millbrook, a thrifty little southern town, is looked upon as slow, plodding, and lacking in ambition by all save Margie Watkins, his sweetheart and daughter of the bank president. Margie, however, becomes attracted to J. Overton Tighe (a partner of James Bradford, notorious promoter of "wildcat" investments), who is newly arrived in town in an expensive car. Despite Andy's warnings, the townspeople eagerly buy shares in a phony stock promoted by Tighe.
Dr. Henry Jekyll experiments with scientific means of revealing the hidden, dark side of man and releases a murderer from within himself.
Tom Whitney, well connected but a social derelict because of his weakness for drink, is released from the draft because of an old football Injury, but a policeman persuades him that he can still do his bit in the shipyards. He takes a job in the yard owned by the man to whose daughter he was engaged in happier times. Three German propagandists seek to foment a strike to delay the work, and largely through Tom's efforts the plan goes amiss and the strike is called off. Rehabilitated by work, the launching of The Liberty is a forecast of his own rebirth.
Arriving with her husband in Arabia, Katherine Wyvrne is ready for romantic times in the exotic Middle East, but her aristocratic husband prefers to be out hunting "Barbara sheep" than fulfilling his wife's desires. She soon meets up with the dashing Arab chief Benchaalai and falls for his charms, but he has a much more sinister goal in mind for her than romance.
Princess Sylvia refuses to marry the Emperor Maximilian of Rhaetia because his proposal has been offered for diplomatic rather than romantic reasons. Learning that Maximilian is traveling to a hunting lodge in a small village, Sylvia follows him, disguised as an untitled English girl, and the emperor immediately falls in love with her.
Gennaro, the son of Lucretia Borgia, lives unaware of the identity of his mother, who has married the Duke of Ferrara. After Lucretia's brother is killed by five conspirators, the fathers of Gennaro's dearest friends, Lucretia tortures the old men to death. Later, Gennaro and his companions journey to Lucretia's domain, and she sees her son for the first time. The Duke, who believes him to be her lover, poisons him, but Lucretia administers the antidote in time and saves his life. Then she schemes to poison her sons' five friends for their fathers' mistake.
Orphaned sisters Kate and Irene are separated as children, but each keeps half of their mother's wedding ring. Years later Irene marries John West, the head of a munitions camp. Kate, as fate would have it, happens to run the saloon in the camp and she and Irene become friends, but neither has any idea that the other is her long-lost sister. Matters take a turn for the worse, however, when Kate starts a romance with Cliff, Irene's adopted brother--a relationship that Irene strongly disapproves of. Complications ensue.