Michael and Derek don't expect the adventure of a lifetime while visiting a Civil War museum with their grandmother. But when the mysterious museum keeper invites them to play a special history game, they suddenly find themselves walking through a door into a very realistic depiction of 1862.

It's only the beginning of their journey as they are whisked away by a carriage to nearby Antietam only days after a violent battle. There, they see for themselves the tragic aftermath of war and come face-to-face with Abraham Lincoln. Suddenly, the boys begin to wonder--is this all real?

Patricia Polacco brings history to vibrant life and uses facts and primary sources to open a doorway through time into a pivotal moment of the Civil War.