Marshall Strong and John Moore, partners in a western gold mine, both fall in love with schoolteacher Constance Harvey, but she marries Moore, even though she is attracted to the shy Strong, because Moore convinces her that Strong loves someone else. After they strike ore, Moore is killed in a barroom brawl and Strong is accused of murder. He hides out and sends for Constance, but when Lilas Niles, a squatter's daughter who wants Strong's money, deceitfully tells him that Constance is sending the police, Strong leaves, embittered, and marries Lilas. Years later, Strong, now known as Mark Smith, is a wealthy mine owner. Constance lives with her son David who loves Strong's daughter Nancy and works in Strong's mine. After Strong refuses demands for safety precautions, an explosion traps David underground. When Strong discovers that David is Constance's son, he rushes into the burning mine to save him. Strong then promises safer conditions, and David marries Nancy.