Oh, how Romka and Leshka didn’t want to languish in Voronezh during the entire autumn holidays. But as soon as a friend’s grandmother read them a half-worn letter, Romka’s eyes lit up. It's no joke: there's a treasure hidden in one of the old town houses! It’s just a matter of little things—in a matter of days, you can find something that has been hidden from human eyes for more than half a century. “Forward, for treasures!” - Romka decides, and the brother and sister set off. Strange events begin to happen while still on the train. In the empty carriage, a real... vampire appears in front of Leshka.