Stagecoach Valor (American Post-Civil War Westerns) by William Black

Ben Daniel takes huge pride in his stage duties and is incensed that another company driver, Merle Rusten, has crossed the line and become a criminal. Rusten has orchestrated a holdup on his stage, leading to the deaths of five people. Ben will need to muster all of his frontier moxie to bring Rusten and four other cold-blooded killers to justice.