On a hot summer day on the embankment of the Seine, a lonely pensioner fell and died of a heart attack. The compassionate concierge is ready to give him a decent funeral. But the photo in the newspaper attracts the attention of people who knew its tenant many years ago. Among them are society ladies and prostitutes, businessmen and tramps, adventurers and spies. The Parisian police are knocked off their feet... Who is he, the modest Monsieur Bouvet?