The summer holidays had barely begun when the White Goose detective agency ceased its work, and its founders went on vacation. Murka and Kisonka Kosinsky go to the south, and Sevka with her father and brothers goes on a tent trip. But work will catch up with real detectives even on vacation. Sevka will completely accidentally find a treasure, and not just any treasure, but gold from the Second World War! It immediately turns out that a gang of local smugglers is looking for this very gold. And it seems that they will go to any meanness just to get the jewelry. Even kidnapping... But it’s not so easy to compete with the “White Goose” detective; the quick-witted Sevka has solved even worse cases!