Jessica is over the moon when her parents take her to Battersea Dogs Home to choose a new puppy—the moment she sets eyes on Chester the russet-brown lurcher she just knows he's the perfect pet for her! hester loves exploring his new home and making friends with the local dogs, and when Jessica bounds downstairs one morning to find the kitchen cupboards wide open and dog biscuits all over the floor, she knows he has well and truly made himself at home! Chester has a secret talent for opening doors, and when Jessica accidentally shuts herself into the dark, scary basement, her clever puppy has his chance to save the day.