The abbot receives a message from the pope informing him that the delegation led by Bernard Gui is on its way. Increasingly worried, he urges that William find the murderer before their arrival.

William works with Severinus, the abbey’s herbalist and scientist, to analyse the monk’s body, concluding he was poisoned before he was thrown into the vat. They soon realise that a highly lethal poison from the herbalist’s collection has been taken.

When their trail leads them to the infamous library, William and Adso devise a plan to enter the labyrinth, but quickly realise that not everything is as it seems once they are inside. Show less