It happened in Alaska. In the city of Nome, an epidemic of diphtheria began, threatening to kill all children. There was an urgent need for a vaccine that was not available in the city. The vaccine was taken by the owner of the city's best dog stool. On the way back, a purge was caught. The dogs, stressing all their forces, went and went forward. But gradually, weakened, they, one after another, lay in the snow, looking at asking for forgiveness from the owner. He fell out of power and man. Only the leader Balte did not give up. The owner cut off the patches and attached a pack of medicines to the dog's neck. There was no other way out. And the dog seemed to understand it. He no longer thought of himself. He thought only of the dog: Will Balth get to Nome, will he go the rest of the way? The man knew he was going to die, and when he suddenly felt a hot dog tongue on his cheeks, he was sure that it was just nonsense. But it was Balt, who, having delivered the vaccine to the village, brought to the help of the owner of the people. He was weakened, and his legs bleed, but what does it matter if there, in the snow, the owner dies...