An incredible event happened in the city of Leshchev - at night a one-legged bear appeared on the street, walking on a crutch. He roared in a human voice: “Give me my leg!” Kirill Belozersky and Feofan Feofanovich Pozolotov are going to investigate this mysterious incident. It turns out that back in the century before last, a terrible tragedy happened in Leshchev. While hunting, the leader of the nobility Grachevsky killed a mother bear and cubs, but a huge bear fell into a trap, but bit off its own leg and ran away. Some time later, a bear on one leg and a crutch broke into the house and tore apart Grachevsky’s wife, and dragged him into the forest. They tried to forget about the terrible story as soon as possible. Now the bear has reappeared on the city streets. His first victim was a former hunter, rumored to be an accomplice in some terrible crime. Yulia decides to join the expedition of her friends, and together they go to the city of Leshchev in search of the one-legged avenger bear.