Brandon, a surveyor, dreams of building a railway to the west. He sets off with his son, Davy, to survey a route. They discover a new pass which will shave 200 miles off the expected distance, but they are set upon by a party of Cheyenne. One of them, a white renegade with only two fingers on his right hand, kills Brandon and scalps him. Davy is all alone now.

In this movie serial, Professor Sturgess invents a miraculous engine which can draw unlimited power from the atoms of the air. When the professor is killed, his daughter and her fiance must fight to keep the secret of the power engine out of the hands of evil Weston Dore and his henchmen.