Lambert owns the trucking line that ships cattle to market. When he raises his rates Roy decides to ship the cattle on the River Boat. When Lambert and his men are unable to stop the boat, they rustle the cattle.
A precocious little girl enjoys life in the Swiss Alps with her grandfather, and he ends his feud with the village so that she can get an education, until her stern aunt takes her away to live in the village in the valley.
This western adventure is based on Zane Grey's novel. Wayne plays a happy-go-lucky cowhand who falls in with rustlers much to the chagrin of his serious-minded relative, lawman Johnny Mack Brown. Wayne also falls for his boss' girl.