"From the day Jukka and his twin sister Vendla discovered that the boglands on their farm in Finland contained buried treasure, they and their friends knew what they were going to do during summer vacation. Starting with a museum of curios in their grainhouse loft, they worked hard to fulfill their dream of a building of their own at the crossroads, with, perhaps, a visit from the great President Svinhufvud on the opening day.
The unexpected mystery that surrounded the disappearance of their most prized possession-a jeweled dagger of ancient design-brought countless days of excitement and suspense to the little band of detectives led by Jukka.
Along with the exciting mystery and the story of how the detectives' search came out, you will read of the eventful lives of the fine people of Finland-of the gaiety of the annual river carnival, of lighting the bog fires to protect the crops from frost, and stories of their national heroes."