In the years before the Great War and the collapse of civilization, many in the United States Government's highest ranks would come to believe that nuclear armageddon was inevitable. Rather than seek in vain to stop this, they sought to take advantage of the collapse of civilization and created many secret projects intended to re-establish American supremacy in the ruins of the world that would follow.

Isabel Cruz, once known as the Mechanist, seeking to atone for her past crimes in service to the Minutemen and the Commonwealth, wishes to do more and uncovers loose threads leading to one such project that has laid dormant for the last two centuries. A dormancy that will soon be coming to an end...