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.
Young inventor Janne is lonely. He falls in love with beautiful girls, but his feelings are not reciprocated. Heartbreak and failure rob Janne of his will to live.
