Twin teenage boys go on an adventure when they have to operate the American Turtle submarines, a secret invention financed by General George Washington to give the Continentals an upper hand in the fight for liberty. To George Washington they are patriots. To loyalists they are traitors. To their older brother.they are his only hope. Fifteen-year-old twins, Ambrose and John Clark, once again find themselves in the thick of things in service of the newly forming United States of America. Their new mission: help transport much-needed gunpowder to the patriots. When they end up in an even more dangerous situation--manning one of the first submarines--it seems the worst is behind them.

Until they have to attempt a prison break to rescue one of their older brothers. Follow these brave young patriots as they continue to follow in their father's footsteps and take even bigger leaps of faith.