Milan, 1506. Leonardo is arrested for poisoning Caterina de Cremona. After protesting his innocence to Stefano Giraldi, Leonardo remembers back to his days as an apprentice in Andrea del Verrocchio's studio, where he first meets Caterina.

Cast: Aidan Turner, Matilda De Angelis, James D'Arcy, Alessandro Sperduti, Robin Renucci, Gabriel Lo Giudice, Josafat Vagni, Massimo De Santis, Andrew Knott, Giancarlo Giannini, Freddie Highmore, Mattia Napoli