In class, Barbara proves to be much further ahead than her classmates in the curriculum; for this reason the teacher decides to assign double the homework to all students. Meanwhile, Sara continues her battle, trying to convince Marioni to give her the chance to play.

Fulvio shows tells us the story of a door, a very famous door, called the Alchemist's Door, also called the Magic Door, or the Door to Heaven, a monument built by Massimiliano Savelli Palombara, Marquis of Pietraforte on the grounds of his villa in Rome.