The musical comedy tells the story of two friends about Usko and Toivo, both of whom happen to have same surname, Lahtinen.
Eemeli leaves the countryside for Helsinki to obtain tax money for the bailiff who is pursuing him. In the capital, he becomes the assistant driver of Andersson, a cab driver. One night while driving, Eemeli meets Vesa and his little sister Jaana, whom Andersson and his granddaughter Katriina take into their family as foster children.
A film group is making movie in the little town. Writer Pentti Töysä interrupts film group's press conference and claims that script is written by him and it is based on true story. Töysä also says that he has written a new ending to the movie and that it reveals an old murder. Not everyone is happy about the new twist.
