La cage aux rossignols

Having completed a book about his experiences as a reform-school teacher, Clement Mathieu (Noel-Noel) is unable to interest a publisher in the project. To make ends meet, he takes a promotional job with toy-airplane manufacturer Raymond (Georges Biscot), who as a gesture of friendship serializes Mathieu's memoirs in the Paris Telegram. Astonished by the story, Mathieu's girlfriend Martine (Michel Francey) wants to know more -- whereupon Mathieu recalls how he was able to organize a group of the most incorrigible reform-school inmates into an angelic-voiced boys' choir (hence the film's title). His tale told, Mathieu is himself astonished to discover that Martine is the cousin of one of his former pupils!