Spoiled society girl Beth Wynn agrees to stake her marriage to Francis Fraser on the outcome of an airplane race with him. Fraser wins, but Beth crashes into a Mexican mountainside and is found by bandits. Buck Fearnley, an uncouth American renegade, takes her to his shack. Then begins a week-long conflict the end of which finds Beth triumphant, Buck regenerated, and the two in love. Buck reunites Beth with Fraser, but a flood wrecks their train, Fraser is drowned, and Buck rescues Beth.