Impressed by Juan's triumphant return from Spain with General Don Hernando at his side, Alexander sends his son to lay siege to the castle of Catherina Sforza's castle, but a surprising turn of events reveals Juan's cowardice; Lucrezia purposely scuttles a scheme to marry her off to a rich Genovese merchant; Savonarola's forces conduct the infamous "Bonfire of the Vanities."