Sinopsis

Dave Martin, who has lately become a motorcycle enthusiast, leaves his Denver home on his machine for a visit with his uncle and cousin who live in the Rockies. His uncle, William Martin, leaves his daughter, Lillian, at the mountain cabin, while he goes to bait his bear trap. While tramping through the woods he accidentally falls into an old abandoned mine and is unable to get out again. A half-breed, in the meantime has stopped at the cabin door, and after begging a drink of water from Lillian, he insults her. She slams the door in his face. Out of fear for her father, who he expects to return at any moment, the half-breed postpones his revenge until later. He finds the bat and gun of Martin and discovers his accident. With the knowledge that the old man is safely out of the way, he returns to the cabin and induces Lillian to go with him up into the mountains, on the explanation that she will see her father. After he has her in his possession be again attempts his assaults, but his career as a bad man is short-lived. The unexpected entrance of Dave at the cabin and his failure to find his relatives there, starts that young man upon a tour of investigation. After a most thrilling ride on his motorcycle along the sky-line drive and an exchange of bullets he manages to recover his cousin without injury to her. Soon afterward he discovers his uncle, and the little family are once more reunited.