How does a sheriff’s department from a small North Texas community stop an invisible murderer that leaves no physical evidence and commits acts so heinous that seasoned officers find the crime scenes too brutal to contemplate?

When grave robbers disturb the tomb of Sheriff James "Two Guns" Tolbert searching for Old West relics, a force is unleashed. Over a hundred years in the making, a vengeful spirit now hunts for its killers.

Even when aided by a Texas Ranger and UCLA paranormal investigators, can modern-day law enforcement stop a spirit destined to fulfill an oath made in death? How do they stop a killer that is already dead and buried?