The posse discover that Gabriel has been taken, and set off in pursuit. But along the way, they meet a morbid inventor, and end up trapped inside a seemingly abandoned Confederate fort.
Rosaleen arrives in Phoenix and is forced to work a dangerous job for the Blackwood Society, as James and Howell try to find her and end up allied with a Texas Ranger.
The posse are reunited and drafted into an illicit job in exchange for information on Virgil Price's whereabouts. They're up to their old tricks...and as always, out of their depth.
The posse must find a way to survive in the desert - But that's the very least of their problems. The force that's been hunting them finally arrives, and they're here to kill.