William goes to the abbeys scriptorium, where he believes lies a copy of a book both Venantius, and Adelmo were reading. While there, William and Adso are disrupted, and someone steals the book. William then discovers a secret entrance to the library, and believes that he has figured out the intricate layout of the labyrinth like library. However, William is wrong and the pair struggle to eventually escape the labyrinth. The next day, William and Adso find Berengar, the assistant librarian, dead in a tub of water. Berengar was missing from the day before where a blood stained rag was discovered in his cell. On the fifth day, a heated debate between the Franciscans and the Pope’s diplomats takes place. Meanwhile, Severinus is found murdered, and the book that William has entrusted to him has been stolen.
On the 7th day, William and Adso discover Jorge In the sacred room of the library. Jorge was an elderly blind monk, who was responsible for the killing. However William further discovers that Jorge isn't behind every death. Adelmo died from suicide, Venantius, Berengar, and Malachi died from reading