In the second book in Julie Murphy's chapter book series for cat lovers, Principal Pickle needs Catty's help. The school has a big mouse problem, and he wants Catty to take care of it. But when Catty befriends the family of mice living in the school's basement, she'll have to choose between her new friends and making the grade. This series is purr-fect for fans of character-driven chapter books like Junie B. Jones, Ivy & Bean, and Judy Moody.