Meet Marty McGuire! Marty would rather spend recess catching frogs in the pond than playing dress-up with the other girls in third grade. So when her teacher casts Marty as the princess in the class play, Marty's absolutely, positively sure that there's been a huge mistake! But after a special lesson in the art of improvisation, Marty comes up with her own plan to improve the play. Maybe a princess in muddy sneakers can live happily ever after, after all!