One day in the lives of tenth-grade students unfolds in different ways: some quarrel for the first time, some try to donate skin to people who have been burned, and some rethink their attitude toward an annoying neighbor who plays the piano when they discover that she is blind.

Kolya Chimbartsev arrived at the boarding school of the port of Krasin from distant Odesa. He is to be met by his hydrologist father. But he has not returned from the scientific station located on the ice floe and has not made radio contact. Kolya and his new friends decide to go on the air themselves through the school radio station. Having broken the device and wanting to delay punishment, the guys are going to the movies. But when they hear a warning about a storm, they hide under the bed and fall asleep, leaving, however, a note that they are going to the movies. An alarm is sounded in the village: the children have gone out in the blizzard...