Kaarina, an orphan girl raised by Taneli, the innkeeper, notices that her friendship with her childhood friend Antti is turning into romance. Henrik, the patron, also has his eye on Kaarina.

Pekka and Pätkä work as inventors. Pätkä accidentally takes a photograph of bank robbers, who begin to track down the photographer. Soma Koivu, the former secretary of the property manager Kiivas, and police officer Antero Kangas help Pekka and Pätkä catch the robbers at a film studio where Pekka is working as a stand-in for Superman.

Justiina gives lessons to friends who are avoiding work and sends them to work. Pekka and Pätkä end up in a woodworking factory, where their job is to nail together the legs of a Christmas tree. The men think they will get rich this way, but through misadventures they end up in many different jobs and being chased by a crowd of admiring women.

At Justiina's insistence, Pekka and Pätkä are looking for work again and end up starting a detective agency. The first assignment takes the duo on a cruise on Lake Saimaa. Traveling on the same ship are representative Johannes Kulo and his daughter Maija, as well as the lumberjack Jussi, who gets caught up in the duo's misadventures.

Engineer Kallio, who is searching for uranium, arrives at the summer hotel owned by Director Lehtelä, accompanied by his assistants Joltinen and Pummi and painter Väinö. The manager's daughter Anni, his wife Mammi, and hotel employee Sirkka try to figure out the guests' secret identities.

A film centered around a popular Finnish song book. Young lovers Pirkko and Pekka break off their engagement at the end of an evening spent at a dance restaurant. At home, Pirkko finds a songbook in her room, whose songs turn into musical scenes. The night watchman carries the songbook with him, and it ends up, via a sad prostitute, a police officer, and a night shelter resident, with Pekka, who is waiting for Pirkko's forgiveness and comes to pick up his fiancée.

A radio reporter from Helsinki arrives in the village of Kankkula just before Midsummer to conduct interviews. The old sheriff demands that his nephew Lauri, who serves as the village policeman, continue the generations-old tradition of arresting the old master of Tippavaara, whom the sheriff believes to be brewing moonshine. However, Lauri is in love with the old man's niece Leena, and the couple's plans to get engaged conflict with Lauri's duties.

Eemeli, a lazy farm boy, is sent out into the world by his parents due to poor potato harvest forecasts. On his way to the logging camp, he meets Tommi, a man from Helsinki who sells razors and is headed to the same destination. At the logging camp, the loggers and Eemeli perform several musical numbers and flee from Isabella, the cook, who is hungry for men.

Pete and Runt travel to Lapland to hunt the snowman in the hope of a cash reward, and take Justiina along as a bait.

After a robbery, a gang of bandits led by Kulaus-Ramperi flees Helsinki on the Kuopio express train "Lentävä kalakukko" and tries to hide in the crowded train filled with music and singing. The cheerful conductor Saastamoinen protects the motley crew traveling on the train.