When Marie Louise, the daughter of the town factor, returns home from school, Julio Sandoval, a reckless young half-breed ruled by his animal instincts, develops a passion for the girl, even though she is engaged to Captain McKeever of the mounted police. Meeting Marie when she is alone in the woods one day, the half-breed carries her to his cabin on the mountain top where he collapses from an attack of mountain fever brought on by overexertion. Taking pity on Julio, Marie nurses him back to health, and when the rescue party arrives, she does not betray him. Upon her return to town, Marie learns that McKeever has been taken prisoner by the outlaw Joe Bedotte. Marie pleads with Julio to rescue the captain, and in gratitude, he goes to the mountains, frees the captain and surrenders his own life as a consequence.