Questioning of Benno and Berengar

William questions Benno of Uppsala, who reveals details of a debate in the scriptorium about laughter and the 'finis Africae,' a mysterious location in the library. Benno suggests that Berengar of Arundel knows a secret. William then confronts Berengar, who, terrified, confesses to seeing Adelmo's ghost in the cemetery on the night of his death. The ghost spoke of damnation and burning, confirming William's suspicion that Adelmo was driven to suicide by guilt and fear.