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In the Arizona Territory, a rookie Pinkerton agent, Benjamin Robertson, goes undercover as 'Bob Smith' on a stagecoach headed to Tombstone. His mission: to unmask and capture a stagecoach robber hiding among his fellow travelers. But as Benjamin goes to work, subtly questioning and observing, he finds himself facing a cunning, experienced adversary, who lives up to his reputation of being a "slippery devil." Comparable works include Pinkerton