In this sixth instalment of Tales from the Cloister, we return to Brother Percival himself - older, warier, and determined to keep out of trouble. Unfortunately, a bumper apple harvest, a few cracked bottles, and the arrival of a very important guest conspire against his better intentions. What begins as a harmless cider soon threatens to unearth old heresies, test ecclesiastical diplomacy, and remind us all why fermentation is a dangerous form of theology.