The Outlaw and the Lady — Chap O'Keefe

Tod Larraby was a deadly shot, an ex-Confederate guerrilla with a reputation to match. But when he was tricked into shooting a crooked gambler in a Colorado mining town, a dubious price was set for his freedom. Lord Buckhampton, a bull-headed British capitalist with investments in the state, needed Larraby to guide him to his delinquent son, who'd vanished into the wildest parts of the Rockies with a half-breed whore from a Leadville bordello. But would Tod be able to complete his task and win his liberty faced as he was with death and deception?