The autopsy on Berengario's body reveals that the monk died drowned, but William discovers strange black spots on his fingers and tongue, similar to those seen on Venantius's corpse. During the night, Baskerville and Adso succeed in entering the library again, in search of the "Finis Africae" mentioned in the code of the dead miniaturist: is it perhaps the room where the key to the crimes is hidden?