Rising artisan Leonardo da Vinci is commissioned by the powerful Medici to create an Easter spectacle in Florence. After some maneuvering, da Vinci is hired to engineer war machines. A mysterious Turk intrigues Leonardo.
Riario engages the Pope and a mysterious prisoner in a discussion concerning the count's defeat, while Leonardo searches for a rational explanation when an outbreak of demonic possession occurs at a convent, and the blame is placed on the Medicis.
Lorenzo orders Piero da Vinci to defend his estranged son in court. During a performance for visiting royalty, Leonardo surprises the corrupt judge. Back at his workshop, Leonardo is surprised by the Turk.