The Medicis commission rising artisan Leonardo da Vinci to create an Easter spectacle in Florence.
The pope's nephew arrives; the failure of Leonardo's war designs causes a rift with the Medicis.
The Medicis are blamed for an outbreak of demonic possession at a convent.
Leonardo reveals his latest weapon as the armies of Rome and Florence face off.
Lorenzo orders Piero da Vinci to defend his estranged son; Leonardo surprises the corrupt judge.
A clue from the Turk leads Leonardo to Wallachia, where he meets Vlad Dracula.
Leonardo travels to the Vatican, where he meets the pope and the mysterious prisoner.
The Pazzis plot to kill Lorenzo and Giuliano; the Turk reveals the location of the Book of Leaves.