In a post-apocalyptic world, a warrior wandering through the desert comes upon a group of settlers who are being menaced by the leader of a murderous gang who's after the water they control.

John Riley, an Irish immigrant soldier recruited in the American army during the Mexican-American War faces anti-immigrant and anti-Catholic bigotry from his fellow servicemen and defects to the Mexican army.

For two couples the future unfolds in different decades and different places, but a hidden connection will bring them together in a way no one could have predicted.