 Jeanne s ex-colleagues, the supermarket cash register ladies, invite her for four days in the Ardennes. To Jef s fury and despair she not only wants him to accompany her, but already registered him for the blabbermouth convention; ever helpful Odilon ruins his sick plant-excuse. The students except Charles-Victor finally see a chance to organize a party in the student house ( kotfuif  in Dutch), but then Chantal briefs over the nasty rumors about Jeanne s shop, so it takes some more lies to get her to stay with her hypochondriac mother. The costume party gets surprising mystery guests...