It's winter in Paris and Madeleine is having problems at school. A new girl, Mirabelle, is bullying her. Madeleine is too ashamed to ask for help from her friends, Madame Pamplemousse and Camembert, but she's befriended by a woman called Madame Bonbon, who runs an alluring-looking sweet shop. The sweets Madame Bonbon gives Madeleine have the most bewitching effect, at first making her feel much stronger and able to confront Mirabelle. But soon they start drawing her into a strange, enchanted world from which she finds she cannot escape. For Madame Bonbon is really someone else in disguise - an old enemy from Madame Pamplemousse's past, who has come to Paris seeking her revenge.