You won’t envy little Fedya Zaitsev: some strangers kicked him out of the house, the boy’s parents disappeared without a trace, and poor Fedya was left alone. And who knows how his fate would have turned out if he had not met the detective brothers Dima and Alyoshka, whom you don’t feed with bread, just let him restore justice and bring the criminals to clean water. So, the crime is obvious, but where are the motives? Who might have liked the unprepossessing little house of the Zaitsev family? “What if there are treasures hidden in the house?” - the guys put forward a version and unexpectedly receive a letter... from Sherlock Holmes...