One of the heroines of the comedy of the Italian playwright Valerio Ronchetti argues that "you should never doubt what the old countesses are up to, especially if they had husbands who squandered their entire inheritance." Is she really right? This is what the participants of the mysterious incident in the house of Louise and Pino Marescchi have to learn, the circumstances of which are unknown, but, according to the detective genre, must certainly be clarified.