François Sim considers himself worthless and he may have good reasons for that. Hasn t he lost his job as well as his wife Caroline? Isn t he unable to relate to Lucy, his teenage daughter? Didn t he, when he was eighteen miss out on passion whereas the sexy, gorgeous Luigia opened her arms to him? Hasn t he - he who keeps craving communication - invariably proved a dreadful bore to others...? So, when Sim is unexpectedly offered a job, he takes it, hoping one more time to give a little bit of meaning to his life. Even if his task amounts to driving across France and trying to sell... a "revolutionary biological toothbrush" to reluctant dentists!