During the height of the Renaissance, a fleet of mysterious ships invades the Italian coast, threatening the Republic of Florence. Commissioned by ruler Lorenzo de’ Medici to discover the source of the invasion and mount a defense, enigmatic sea captain Niccolo Corsini must navigate political waters as treacherous as any typhoon, where discerning friend from foe proves nearly impossible. While attempting to identify the sponsor of this hostile force, Niccolo enlists the help of young Leonardo da Vinci to devise a strategy against an enemy fleet twice the size of the Florentine navy. Yet even with da Vinci’s assistance, how can Niccolo hope to save the Republic from utter destruction when the overwhelming enemy fleet arrives in one week’s time?