Robert Langlois, law student

Fernand Langlois, father, professor

Gabrielle Langlois, mother

Catherine Liseray, young neighbor

Mr. Calomel, neighbor on the floor above

Street violinist

Marie-Louise, first maid

Madeleine Sautaupain, Mom's friend

Léon “Alibi”, friend of Robert

Student of Mr. Langlois