Annette finds a baby in the snow alongside her dead mother and takes it to Baptiste Dupre and his wife, where the two of them grow up. A corrupt sheriff is infatuated with her, and Jean Rivard (Tom Mix), an officer in the Royal Canadian Mounted Police, must rescue her from him. Ace High is one of the earliest surviving Tom Mix westerns.

"A Tale of Adventure In the Service of the Canadian Northwestern Mounted Police."