 When Koen repairs a baby-phone for sweetshop-customer Pieter s ma, it soon becomes a weapon in Jo s efforts to discredit Ria, who unlike him is allowed to receive partners of the other gender in her room. Its main use however is by Jeanne herself, to spy on the secret meetings concerning the annual top-secret matter of her up-coming birthday-gift, which she is most eager to steer by means of tips, aided clumsily as ever by Odilon, who was excluded from the committee because he can t keep anything silent.