The Jean family leads a happy life. Her husband, Fran ç ois Marthouret, is hardworking and kind; his wife Helen (É velyne Dandry) is gentle and dignified; and their children Nicholas (Adrien de Van) and Sophie (Marina de Van) are obedient. However, the arrival of an uninvited guest disturbed everything in the family. One day, Jean brought back a little mouse from the lab. The gentle and lovely little creature seemed to have terrible magic, and the temperament of all the people who came into contact with him changed greatly. First Nicholas suddenly declared himself gay at the dinner table, then Sophie sleepwalked and fell into a serious injury, and the chaos escalated. The film won the 1998 Sitges-Catalonian International Film Festival Best Actress Award (É velyne Dandry).