The Martin family is shopping in a department store. Tiennot is responsible for looking after his little brother, Bébert, but he prefers to chase girls. On the train home, Tiennot leaves Bébert alone. On arrival, Bébert has disappeared. The Martin family sets out to find him.
Martin Lartigue
Bébert Martin
Jean Richard
Mr. Martin
Blanchette Brunoy
Mrs. Martin
Jacques Higelin
Tiennot Martin
Pierre Mondy
Parmelin
Michel Serrault
Barthoin
Jean Lefebvre
Glandier
Christian Marin
Station employee
