A twelve year old boy who lives in a small town where strict social codes are observed, joins the choir to get to know a young girl of his own age whom he has seen at mass.
The leading coach the company of Jean Nohain make a program fails in a small village. The people immobilize the troops to force him to do the show there.
Although suspected and hunted down by policeman Sherlock Coco and inspector Hector, the Pieds Nickelés (Croquignol, Filochard and Ribouldingue) manage to save the legacy of Monsieur Miradoux, who will be very grateful to them.
