Inspired by her grandparents' bakery and her recent visit to Paris, nine-year-old Grace leads her friends in starting La Petite Patisserie, making and selling French pastries at school and special events, but they soon discover that starting a new business is not always easy--or fun.

Ten-year-old Grace is crushed to learn that her grandparents' bakery might close after thirty years and wonders how her own business, which they inspired, can survive if theirs cannot, but she and her friends use their talents and newly-acquired business skills to try to save the day.