Lucilla is a reluctant duchess. When her parents go away—her father off preparing for war, her mother on a social call—she doesn't want to stay locked inside the castle she calls home. So, donning a boy's outfit, she sneaks off with her tutor, Brother Cosimo, across the Tuscan countryside, and they soon run into her orphan friends, Tosca and her brother Rinaldo. Both fun and danger await on the road to a monastery, where secrets from the past creep into the light as the darkness of war looms in Tuscany.