After a violent encounter that leaves four Mexican soldiers dead, Texas Ranger Hackberry Holland escapes the country in possession of a stolen artifact, earning the ire of a bloodthirsty Austrian arms dealer who then places his son, Ishmael, squarely in the crosshairs of a plot to recapture his prize, believed to be the mythic cup of Christ. Along the way, we meet three extraordinary women, each of whom will aid Hackberry in his quest to reconcile with Ishmael, vanquish their enemies, and return the Grail to its rightful place.