A woman in Paris hires a taxi driver to locate her ex-lover, father to her newborn child, who left her without leaving an address.
Émile Gauthier, chauffeur de taxi et trésorier du syndicat
Thérèse Ravenaz, jeune mineure provinciale
Gaston, le co-chauffeur d'Émile
L'ami de Forestier
Le tapissier