Gypsies suddenly appear in a small town, and after this children begin to disappear. They were killed and then found in the forest! The boy Arthur and his friends visited crime scenes, and everywhere they found the same footprints of rubber boots with the numbers 43 on the soles and a crack in the heel. A little time passes, and Arthur’s mother and grandmother die in a car accident - the car in which they were traveling fell under the wheels of a heavy tractor. The boy believes that this particular tractor driver is the same serial maniac, but the investigation finds boots with a crack in the gypsy camp. Then Arthur vowed to find the culprit himself. And now thirty years have passed... Four alternative endings of the detective story create an amazing feeling of the diversity of logical moves and the unpredictability of our lives.