A love story between a taxi driver and a travel guide in the form of a musical.

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.