Science fiction serial.

Feodor Turov, chief of the Russian Czar's secret police, orders his Cossacks to attack a village he believes to be infested with rebels. The Cossacks attack the village and massacre almost everyone, and the young Katerina is whipped to death. Before escaping to England, her sister Darya swears to avenge her sister's death. Years later--now one of the world's most famous prima ballerinas--she returns to Russia. Turov falls in love with her and manages to secure a meeting. She coyly asks him to take her to see a prison first. As it turns out, what he has planned for her is nothing compared to what she has planned for him.

Financial troubles force Nell Carroll, a thoroughbred, to seek employment in a detective agency which has just taken up the trail of a very baffling jewelry robbery in an exclusive summer colony. In order to work from the inside, she is sent to the place as the Baroness Du Vassey.

Mary Doone (Theda Bara) is a poor British girl who runs away from her adopted family because the father made a pass at her. She lives at a parish house, and at the outbreak of World War I, she becomes a Red Cross nurse.

Reformers pass a law to force prostitutes out of the Red Light District.

A powerful financial magnate is plotted against by his greedy son.

A wealthy financier is tricked by a pair of spies into giving millions to foreign powers. His daughter is suspicious and hires a Detective, who is able to foil the foreign agent's plans. Meanwhile, the daughter has fallen in love with a fellow from the enemy camp, but all ends well as his true identity is revealed as a member of the U.S. secret service.

Little Kate and Janie O'Dowd are sent to their wealthy American uncle, Michael O'Dowd, after their Irish father loses his life on a World War I battlefield. Having been locked accidentally into O'Dowd's munitions plant one evening, the children catch sight of their intoxicated cousin Miles O'Dowd admitting two men into the factory. The girls recognize the two as spies they had seen on the boat to America sending signals to a German submarine. After the spies knock Miles cold, the children trap them in a die-stamping machine until help arrives.

An old inventor is robbed of his inventions by an unscrupulous rich man. When the inventor dies, his daughter Violet goes to New York and joins the "Follies," where she is advertised as "The Belle of New York." The rich man's son is infatuated with Violet, and is introduced to her anonymously as Jack. When Violet learns of Jack's identity, she casts him off. He takes to drinking and she joins the Salvation Army. Jack is attacked in an underworld saloon just as Violet enters in Salvation Army attire. She nurses him at his home. When Jack's father discovers with whom Jack is in love, he begs forgiveness for the wrong he did Violet's father.

In Scotland in 1751, young David Balfour is shanghaied aboard a ship where he meets Jacobite rebel Alan Breck Stewart with whom he escapes to the Scottish Highlands, dodging the redcoats.