Pierre a stuffy, self-righteous volunteer at a telephone helpline for depressed people and his well-meaning but naïve co-worker Thérèse, are stuck with the Christmas Eve shift in the Paris office, much to their displeasure.
La permanence téléphonique parisienne SOS détresse-amitié est perturbée le soir de Noël par l'arrivée de personnages marginaux farfelus qui provoquent des catastrophes en chaîne.