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.