Thomas and his little sister Birdie have spent their whole lives as slaves on a farm in Virginia. It’s a hard life, but at least they are together. But then one day, men come to take Thomas away, and Thomas realizes he has no choice: he and Birdie must escape to the North. With slave hunters on their trail, they rush into the dark forest, beginning a journey they hope will lead to freedom. But soon they are swept up into the bloodiest battle in American history: The Battle of Gettysburg.