Romka and Leshka had just arrived at the dacha when a new case was already awaiting them. In Asya's girl's house there is... a ghost who wanders around at night, scaring her. The guys decided to find out what this phenomenon was and stayed with Asya. Late at night, Romka noticed a strange shadow... However, the ghost managed to escape! Further investigation was prevented by the arrival of students of Askin’s archaeologist grandfather. But soon misfortunes began to happen to them: a heavy wardrobe fell on one, a candlestick fell on another, a third fell from the stairs... It seemed that the ghost was escaping all strangers from the house. And so the young detectives found out: somewhere in the house were hidden documents confirming that grandfather had made an important scientific discovery. Now it’s clear what the mysterious “ghost” wants: to take possession of these papers, find the treasure and get fabulously rich!..