Hawke: Showdown at Dead End Canyon by Robert Vaughan

There's no peace for Mason Hawke from the ghosts of his past. A drifter and a loner, he's not looking for trouble when he rides into Wyoming Territory –– but it's waiting for him nonetheless. Coming to the rescue of a wealthy landowner's daughter who was kidnapped by a pair of inept outlaws, Hawke finds himself an unlikely hero in a town called Green River.

But his unsought celebrity has earned him some powerful enemies, including a land–hungry lady with a crooked official in her pocket and a ruthless killer on a leash. Justice, it seems, is an illusion in this place where fraud and fortune hunting dance with cold–blooded murder. But all that is about to change in a brutal hail of gunfire now that Hawke has come to play.