Every third grader has problems. Classwork. Strict teachers. Middle school bullies. But not every third grader's problems include a younger sister who has run away from her classroom in tears. Maybe that makes Ana special. Or maybe it makes her a third grader most likely to get caught breaking a hundred school rules.

With the help of her classmates, Ana tries to deal with her runaway sister. But how long will the third-grade gang manage to keep their sobbing secret?