Mackenzie’s Mountain by Linda Howard

A small Wyoming town is about to learn a few lessons — from a new schoolteacher with the courage to win the heart of a man who swore he had nothing to give…
Mary Elizabeth Potter is a self-appointed spinster with no illusions about love. But she is a good teacher — and she wants Wolf MacKenzie’s son back in school. And after one heated confrontation with the boy’s father, she knows father and son have changed her life forever.
Still paying for a crime he didn’t commit, Wolf MacKenzie has a chip on his shoulder the size of Wyoming. But prim-and-proper Mary Elizabeth Potter doesn’t see Wolf as the dangerous half-breed the town has branded him. Somehow she sees him as a good, decent, honest man. A man who could love…
Wolf’s not sure he — or the town of Ruth, Wyoming — is ready for the taming of Wolf MacKenzie.