The Ghost of Sir Herbert Dungeonstone

The plot centers around Wiglaf and his friends, Angus and Erica, who uncover mysterious noises in the dungeon of DSA. Their investigation leads to the unintentional release of Sir Herbert Dungeonstone, the school's founder, who has been imprisoned for years. Excited by his newfound freedom, Sir Herbert begins to disrupt the headmaster's ambitions to transform DSA into a coeducational institution, setting the stage for chaos and adventure as the characters navigate the consequences of their actions.