History teacher Nathan Greene's plans for his students to hear Abraham Lincoln present his Gettysburg Address go awry when two ghostly historians secretly change the plans. Instead, the time-traveling classroom portable lands just before dawn on July 1, 1863, the first day of the Battle of Gettysburg.
American history teacher Nathan Greene looked at his bulletin board. How did Benedict Arnold become the second president of the United States? And who the heck was Shippen Jefferson? Where were John Adams and John Quincy Adams? Had Greene and his high school students inadvertently changed history with their field trip to the Philadelphia of 1776?