A fire in the mountains drives a wolf pack into the nearby desert where they terrorize the local residents. The leader of the wolf pack is Lobo, actually a halfbreed (Rin Tin Tin). When the pack is discovered hunting a herd of cows, a posse gives chase. Lobo leaves his pack to lead the posse away. He is injured and found by a local prospector, Dave Weston (Charles Farrell). The prospector nurses Lobo back to health and the two become close friends. Meanwhile, Weston has made a Borax find in the area. His girlfriend May Barstowe (June Marlowe), daughter of a wealthy rancher, is pleased. However, the local chemist, Borax Horton (Pat Hartigan), actually a claim jumper, plans to steal the claim.
A prospector becomes a small town outcast after he rescues a man about to be lynched.
Wealthy Anne Wilmot vacationing along with her aunt Katherine at her fiancé Leon Morse's (Hull) Arizona mountain lodge discovers his plot to destroy a nearby hydroelectric engineering project in order to obtain the land for his railway. She thwarts the sabotage but find herself in a life and death struggle.
Notorious liar Windy Watkins is pursued by Marshal Flynn when he tells a story about mining in Northwest Canada and the murder of his partner.
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