Judith Collet, an artificer, is found killed by a firework rocket she was going to fire. Investigators discover that the young woman had been hiding a secret for a few months. Indeed, Judith left the marital home two evenings a week. The police are wondering about the existence of a potential lover that her husband would have discovered, unless there is a link with the promotion that the young woman had refused. The murder could also be attributed to a colleague of Judith who took revenge out of jealousy...
