Avsnitt 4

Leonardo and Tom are commissioned to paint a portrait of young bride-to-be Petronella,who is marrying thuggish,dishonest money lender Lucio solely to free her father from being in his debt. Macchiavelli recognizes Lucio as a man who hurt him when he was a child and,with the artists' help,concocts a plan playing to Lucio's greed by making him pay 100,000 florins for what they have told him is the alchemist's stone,to turn lead into gold . Having parted him from his money they then literally frame him for stealing a painting,freeing Petronella - who guesses 'Tom's' secret but says nothing.