14,000 year-old "Man from Earth" John Oldman, now teaching in northern California, realizes that not only is he finally starting to age, but four students have discovered his deepest secret, putting his life in grave danger and potentially destroying the world's most popular religion.

As Abraham Lincoln labors over the Gettysburg address, the importance of which he is fully aware, he learns that a menace from his past has returned, threatening to tear the already fractured nation to pieces. He must journey behind enemy lines to face an foe far more fearsome than the Confederate army: the walking dead.