The Gun Tamer by Max Brand

When Don Felipe Consalvo showed up at the McCay ranch, none could suspect that beneath his grace and charm there lurked a deadly gunman—but Sheriff Rankin knew he was bringing trouble with him. And when Colonel McCay’s daughter fell in love with him, Rankin knew it was part of Consalvo’s plan to gain their wealth. But how could he stop him, when no man who ever faced Consalvo in a showdown lived to tell the tale?