David Belkov, a newsboy born of foreign parents who live in "New York's crucible," the East Side, admires the late Theodore Roosevelt, but when he sees a poor family being evicted, he joins the Hogan Street anarchist group, of which his father's friends and his sweetheart Yolanda Kosloff, are members. The group plans to assassinate Judge Norton, who earlier condemned one of their comrades to the electric chair. After David witnesses the bravery of twelve-year-old Mary Hogan, who sings patriotic ditties to drown out the soap box orations of the anarchists, he prints leaflets to combat the anarchist views. Mary is killed trying to thwart the anarchists' plot, and David is caught and badly beaten. After government agents, thought to be converts, break up the gang, David arrives just in time to stop Yolanda, who is dancing at a celebration at Norton's home, from dropping a bomb. David is shot by the anarchist leader, but Yolanda, realizing her error, nurses him to health.

Penniless aristocrat Yvonne Dupré ekes out a living selling her paintings to a crooked dealer, Leon Naisson, who passes them off as other more famous artists. Leon confides to his unscrupulous model Romildo, that he is attracted to Yvonne. Romildo drugs his lover, fiery Apache dancer Juliette who closely resembles Yvonne, then tries to extort money from Leon to have his way with her. Leon discovers the duplicity but convinces the artist's sweetheart, Dick Gray, that she has been unfaithful. As police close in on Leon, he frames Yvonne by planting forged paintings in her studio. Following Yvonne's arrest, Juliette is informed by her foster sister that she was stolen by gypsies as a child and is actually Yvonne's twin sister. Juliette exposes Leon's operation to the police, reuniting Yvonne and Dick.

Lost silent melodrama was actress Florence Hackett's final film.