在这部一笼夜莺剧情/音乐片中,一位曾在感化院担任教师的马修，想把自己在感化院中的故事写成书出版，但是却得不到出版商的兴趣。在困顿之虞，马修替一位玩具飞机制造商担任宣传，而制造商雷蒙则设法拜托朋友在报社设一个专栏来记载马修的故事。而在刊登后，马修的女友玛婷大感兴趣，要求马修述说更多细节，因而马修回忆起当初在感化院中，训练一群被认为是无可救药的孩子，成为杰出的儿童合唱团。而在故事说完时，马修这才发现原来玛婷是当年其中一位顽皮学生的表姐。
"La Cage aux rossignols" (A Cage of Nightingales) is the title of an autobiographical book that a young writer try to publish, which would allow him to marry so charming Martine. Under a pseudonym, Clement's book is published in La Dépêche a daily newspaper that publishes novels as serials. Martine can read the novel to her mother (voice-over). Story of this music lover, supervisor of a boarding reserved for young offenders who asks only to discover the joys of music by forming a choir. But Clément does not have only friends. The director of the institution, man petty and narrow-minded, never misses an opportunity to throw a spanner in the works...
