Sometime Pinkerton Agent, Deputy US Marshal and freelance detective Lucas Santana is ordered south to Riverton County, Texas, to investigate the rumoured growing unrest there. The ambitious Frank Vagg controls the local law on both the Mexican and Texas side of the Rio Grande. When the lead begins to fly, Santana is joined by fellow Pinkerton agents Joshua Beaufort and Jacob Benbow and the body count grows in the grim, grey borderline county where no ravens fly.
