Pourquoi viens-tu si tard?

In a small town where he is waiting for his train, reporter-photographer Walter Hermelin meets Catherine Ferrer, a female lawyer who has just obtained the acquittal of a man accused of having killed his alcoholic father. Catherine must now plead in a libel suit against a wine-selling company and she has the idea to ask Walter to help her get exhibits incriminating the wine merchants. The reporter agrees and takes frightening photographs showing how poor people, including youngsters, are incited to drink and destroy their health...