Mac is a mouse who lives at the oldest operating gristmill in the United States. When he falls through the hole in the center of a millstone, he accidentally travels back in time, setting off a journey that follows the very history of the mill itself. Mac visits various times in the history of the mill, from its beginnings in 1682 through its part in both the American Revolution and the Civil War. While he tries to get back to his own time, he faces...