Fireball

S1, E12: Leo and Lisa are summoned to the Medici Palace to undertake a special commission. Since they have stolen back Leo's notebook and Piero knows Lisa is a girl, they fear the worst. However Piero is charming and explains that he wants Leo to join with him for the good of Florence. When Leo discovers that Piero has had all his designs built, he is convinced, but it turns out that Piero's intentions may not be so good after all.