Anna, thanks to the fog, dresses up as a boy and manages to infiltrate the abbey. The woman is looking for Remigio to ask him to give her back the letters that Dolcino had given him before being arrested and killed. But the letters have disappeared and probably ended up in the wrong hands. Severino, the herbalist monk, tells Guglielmo that he found a strange book in his laboratory: is it the memories of Dolcino or something else?