At a trading post in the Northern Dakotas, Hawk Lespard, an unscrupulous trader, finds an adversary in Jack Jessup, a scout for the Overland Stage Co., who poses as both a gambler and as Native American lariat master Kunga-Sunga. John Gregg comes to town as storekeeper with his niece, Barbara Marshall, and Jack falls in love with her. Meanwhile, Lespard's men disguise themselves as Native Americans and turn the Sioux chiefs against the white man. Jack is forced into hiding by the Sioux after he is revealed to be Kunga-Sunga. Lespard leads a renegade band against a wagon train of new settlers, but Jack dons a disguise and informs the chief of the trader's treachery. The attackers are defeated, the Sioux are reconciled, and Barbara and Jack are married.
