Zona Libre is a small enclave across the river from America. Despotically ruled by General Calleja, it offers sanctuary to outlaws, at a price. Newly arrived is Clete Mattson who has $2million in gold to buy guns for the Confederacy. But who can he trust with so much money around? Certainly not Calleja, but maybe the eye-catching Carmelita? The General thinks she's his property but she seems rather to fancy Mattson. Whatever's going on, Mexico wants the place back.