The Outlaw of Buffalo Flat — Max Brand

Handsome Harry Delancey rode through the hills on his mighty gray horse El Rey, and he overpowered his victims like the swooping hawk that was his dreaded emblem. But behind the dangerous outlaw disguise was Ching Wo, a studious young Chinese man with an intense hatred for whites.

Then one day Ching Wo was forced to make a choice between the sacred Chinese customs of his boyhood and a chance for love in the alien world of the white man.