They've killed five men already, and stolen a quarter of a million dollars in silver and gold. Now, a band of vicious thieves has drawn the best man that Wells Fargo can send: the rangy, mysterious Chicago-based Pinkerton agent named Ash Tallman. An operator who works with a pleasure-loving beauty who goes by many names and does her best work in the least amount of clothes, Tallman is heading to Red Rock, Arizona Territory. In the shadow of the towering Ricon mountain range, hardcase highwaymen are plotting their next hold-up and will hurt as many people as they can along the way. Ash and his lady, both going deep undercover, quickly find their way inside the strange, vicious outlaw band. But that's only the beginning. For while the killing goes down in Red Rock, the planning takes place in Tucson. And that's where two outgunned Pinkertons must face an evil all its own...