Monsieur Lully and his musicians are in the middle of rehearsal when Ariane, suddenly losing all control, throws herself onto the cushion where Gazette was sitting and tears it to pieces! Devastated, the mouse cannot forgive her friend, who could have caused her serious harm! Ariane is very troubled: what is happening to her? Belfort and Lupin will help her reconcile with her best friend. While Ariane thinks she has caught rabies, our heroes discover that an unexpected musical instrument is responsible for the Siamese cat's outbursts.
Monsieur Lully et ses musiciens sont en pleine répétition quand Ariane, perdant soudain tout contrôle, se jette sur le coussin où était assise Gazette.
