Weaver discovers a shocking truth about an old friend and must decide how to best protect the 2nd Mass. Maggie and Isabella are forced to work together.

Tom gains a powerful new weapon. Ben puts his life on the line to extract enemy plans. Pope discovers that Tom is alive. Meanwhile, the 2nd Mass must reassess their situation when an unexpected visitor appears.

The final standoff brings the Masons, the 2nd Mass, and their new allies into the bowels of an iconic American location, wrought with new and unpredictable obstacles. Despite great loss along the way, they must persevere with hopes of once and for all reclaiming Earth and humanity.