In a secluded abbey, William and Adso investigate the death of a young monk, but meet resistance.

William and Adso enter the forbidden library after the next tragical incident shocks the abbey.

William finds more clues while Adso researches about Dolcino. A woman named Anna swears revenge.

William and Adso unveil a secret and discover a new victim. The delegations for the debate arrive.

William and Adso discover Remigio's past. The debate begins with bad news for the Franciscans.

William loses an important clue to the case while Adso tries to rescue the red-haired girl.

Under Bernard Gui's command a trial against Remigio begins and he is betrayed by a close friend.

Adso and William enter the library to solve the case but they face a much bigger catastrophe.

A murder mystery in an abbey.