A Dangerous Foe

During his daily duties, Casey the Cop rescues a woman who's soon his sweetheart. Later, she learns from her banker uncle that her inheritance has been stolen, and he's accusing Casey's own cashier brother. Casey is on the case.

Male and female sales agents, Phil and Ruth, for rival hosiery concerns try to land an order. For a while Phil succeeds and puts on an exhibition but Ruby makes the mannequins use her own brand of hose, flirts with the buyer and wins order away from her rival.

Lydia Jansen is happily married to a young customs inspector, but she harbors a dark secret. She is addicted to smoking opium or in slang parlance “hop.” To keep her secret, she willingly pays the blackmail her maid extorts from her having learned of Lydia’s habit through her own fiancée who is part of the ring importing the devil’s brew. Something unknown to all is that the operation is run by Lydia’s father an important politician in the city where this all occurs. As her husband’s investigation tightens the noose on the organization Lydia faces a crisis.

Muggsy Mulane, a waif who wears boy's clothing, jumps a freight train to the country after Jimmy "the Eel," the leader of the gang of crooks with whom she works, is arrested. In the village of Cottonville, Muggsy befriends Aunt Sarah, whom she later discovers is Jimmy's mother. When Muggsy learns that the greedy Judge Cotton, who holds the mortgage on Aunt Sarah's property, is planning to foreclose, she threatens to blackmail him, and he relents.

Lisza Tapenko (Bara) is governess in the household of Prince Arbasoff (Charles Clary). After the death of his wife, Lisza and he become involved, but because of the difference in social station he refuses to marry her. Lisza's former lover, Vassya (Richard Ordynski), convinces her to join the revolution and she goes off to the group headquarters in Switzerland. But the prince's little boy begs to have Lisza come back, so he goes after her and marries her.

Based on the Rupert Hughes novel, this film concerns the German atrocities committed in Belgium at the beginning of the Great War.

Marion Clark, a manicurist, is unimpressed by the wealthy but dissipated men who frequent her shop, preferring city editor Dick Strong, who lives in her boardinghouse. Dick's sister Gladys, however, is intrigued by the wilder side of life in New York and allows one of the boarders to take her to a lively party.

Japanese poet Akira living in Tokyo, loves American Ruth Vale, who was placed in the care of Akira's father when her missionary parents died. Ruth returns Akira's affections until she meets Edward, but the American proves an unfaithful husband. Three years later, Ruth is gravely ill while Edward amuses himself with his new lover, Adrienne Chester, but Akira comforts the dying woman with the promise that he will protect her little daughter Blossom.

Robert Lanning, a proper Bostonian who owns an estate in southern New Mexico, suspects that some of his employees are smuggling arms into Mexico, and sends his son, Robert Jr., to investigate. During his journey west, Robert meets Mary Hamilton, a stranded actress from a roadshow company of Uncle Tom's Cabin. Because Mary is still in costume as the character, “Little Eva,” Robert mistakes her for a child and takes her with him to the ranch. He ultimately discovers the identity of the arms smugglers and, with the help of the Mexican Rurales, brings the gang to justice. Robert then realizes that Mary is not a child and wins her for his wife.

Montgomery Seaton, one of the idle rich, pays more attention to his friends' business than to his marital situation.

Rethna works hard to organize her fellow factory employees against the miserly, uncaring owner, Henry Burke. Then, realizing that she needs money to fight Burke, she begins an affair with his unscrupulous son Harry.

Coddled by his maiden aunts and apparently unable to make decisions, Oliver Wendell Blaine signs up for a mail-order course in "Success." Oliver follows the instructions step by step, builds his self-confidence, and proves himself a hero when a log jam threatens the town. He is made river boss and marries Phyllis Thorpe, daughter of the owner of the lumber-mill.