Interviewing an alcoholic Native American who witnessed a murder along the Texas-Mexico border, Sheriff Hack Holland and his deputy, Sam Tibbs, recognize the work of serial killer Preacher Jack Collins in an investigation that is assisted by the enigmatic Anton Ling.

"[T]he story of a father and son separated by war and circumstance--and whose encounter with the legendary Holy Grail will change their lives forever-- an epic tale of love, loss, betrayal, vengeance, and retribution that follows Texas Ranger Hackberry Holland on his journey to reunite with his estranged son, Ishmael, a captain in the United States Army" -- "After a violent encounter that leaves four Mexican soldiers dead, Hackberry escapes the country...