After escaping the gallows Mousebeard is determined to seek revenge on his mortal enemy, Isiah Lovelock. Now fugitives themselves, Emiline and Scratcher take up the pirate’s cause. From infiltrating the garrison port of Hamlyn to discovering a lost world of mice, the young mousekeepers will fight old enemies and terrifying battles in their quest. Failure is not an option because Old Town’s power is on the rise and only Mousebeard can stop it.