A supervisor takes care of children in a holiday camp in the mountain.He meets a pretty girl on the train ,who happens to live with her uncle in a castle not far away from the camp.Disguised as Robin Hood, he entertains his boys by making them play the roles of his companions.The girl would like to invite the young man in her uncle's place ,but he will not hear of it,and he even imprisons his niece in the high tower.He's actually the head of a gang of smugglers."Robin" and his mates will help the Gendarmes to confound these dangerous crooks.