When young schoolteacher Mary Adams is out of the classroom, she dreams of the days when the world was peopled by knights and beautiful ladies in distress. She is so imbued with the spirit of romance that when a strange young man rescues her from a street ruffian, she idolizes her hero, picturing him as a regular Sir Galahad. Mary's rescuer is Jim Anthony, a mechanic with inventive talents. Embittered after his invention is stolen, he becomes a burglar. Knowing nothing of this, Mary falls in love with him and marries him. He's a product of the slums, and in his wandering he has lost track of his mother. When he finally learns that she's living in the Carolina mountains, he persuades Mary to go with him to visit her. He takes with him a bag of jewelry, the plunder gained in his recent robberies. They find Anthony's mother living alone in a hut. The old woman has become a wretched creature. She fails to recognize her son, who asks for a night's shelter for himself and his wife. While unpacking, Mary discovers the jewelry and confronts Jim, who confesses his crime. Horrified, Mary orders Jim from the room, locks herself in, and goes to sleep on a couch in the main room. The old woman finds the jewels and her cupidity leads her to try to kill the man she doesn't know as her son. Mary finds Jim unconscious from his wound and hurries to the village for medical aid. She keeps away from him, and on his recovery he returns to the city and makes restitution of the stolen property. A reconciliation is brought about several years later.