Set 15 years after the events of the first film, the Tetragrammaton has managed reestablish itself despite the truth of Father coming to light. Their main focus has been the complete annihilation of the Resistance, and it's supposed savior, former Grammaton Cleric 1st Class John Preston. To do so, they have a team of next generation Grammaton Clerics to eliminate the Resistance and bring the rogue Cleric to face summary destruction. Leading this group of Clerics is Robbie Preston, John Preston's son, and while it seems he is simply following orders, he does have another reason for accepting this task.
—Kendrick Grey