Tom Rigby didn't think that anything could ever come between him and his twin, Jack. But things begin to change when Tom learns that they are not allowed to play with their friend Aaron anymore because he's a slave. Tom is upset, but Jack doesn't seem to care. All Jack cares about is playing soldier. Eleven years later, when war breaks out, Jack joins the Confederation army. But Tom can't bring himself to fight for a cause he doesn't believe in -- slavery. So Tom rides north to join the Union army -- even though he knows he may one day have to face his brother on the battlefield.