Mattila's relatives Konstu and Fransi travel to Helsinki to meet their friend Kalle Liljepeki, who runs a failing general store in Sörnäis. The companions get Maiki, the daughter of the house, and Sundi, a forest consultant. A lot of misunderstandings arise and a story about the devil in Kalle's shop.

Polyteekkarifilmi (Polytekarfilmen) is a Finnish silent documentary film dating from 1924. The subtitle of the documentary is "The story of sport, polytheists and the gods of Olympia". The film aimed to raise travel funds for Finnish athletes traveling to the Paris Olympics.