The Smile (2008) is a Young Adult novel by Donna Jo Napoli that details a slice of the life of Monna Elisabetta, better known as the Mona Lisa. Some historical figures enter the plot, including Leonardo da Vinci and members of the famous Medici family. Set in Renaissance Florence, it follows Elisabetta's life up to the moment she models for da Vinci's painting, and suggests the secret behind her famous smile. Source: Wikipedia (en)