When Union soldier Caitlin McKae wakes up in Atlanta wounded in battle, the Georgian doctor believes her only secret is that she had been fighting for the Confederacy disguised as a man. In order to avoid arrest or worse, Caitlin hides her true identity and makes a new life for herself in Atlanta, thus creating a new secret to hide. Trained as a teacher, she accepts a job as a governess for the daughter of Noah Becker, a German immigrant lawyer who enlists with the Rebel army to defend his homeland against Sherman's army.