The gangsters are planning to rob a famous chocolate shop in Paris using the children as decoys. The Pott children overhear this and manage to warn the shop owner, Monsieur Bon-Bon. Chitty arrives in time to prevent the gangsters from fleeing. The police arrive and the gangsters are taken away. As a reward Madame Bon-Bon shares the secret recipe of her world-famous fudge with the Potts, and the two families become good friends. Chitty flies the family away to parts unknown, and the book implies that the car has yet more secrets.