In 1954, escorted by a sergeant, a French nun travels through Tonkin, spreading the good Catholic word as she goes. A mute child leads her to a remote village. Installed at a carpenter, the travelers prepare the projection material indispensable to their propaganda. At nightfall, in a storm, a group of maquisards surrounded the house. Fortunately, the carpenter is a respected man. The attackers withdraw. After a sudden rise in water, the mute child loses the precious message that had been entrusted to him by a wounded maquis..