Square-Shooter by William MacLeod Raine

Cole Sanborn has a notorious reputation and seems to be the culprit behind the robbery of the K&J Express train. Rather than hide out, Cole casually hangs out in plain view of the town of Jonesboro knowing someone impersonated him. In fact, he volunteers to help Sheriff Magruder solve the case. He soon finds the town and its officials under the thumb of power hungry Chet Radbourne....