Arizona Territory 1848. The year the Mexican War ended. Fate and blazing pistols have just thrown together reporter and part-time drunk Marion T. Bell and the very nearly legendary John Charles Hart, mustanger and scout, in the Little Fanny Saloon .

Bell and the easy-going giant Mother Knuckles stumble upon Elena, a fierce, young, badly wounded Mexican woman near the banks of the Colorado. She's naked. She's been bullwhipped, knifed and branded. She and her sister, still there, have endured kidnap, rape and servitude at the hands of las hermanas de lupo, the deadly Valenzura Sisters and their henchman, the deserter Paddy Ryan, at the well-manned slave-camp across the river aptly called Garanta del Diablo—Mouth of the Devil