Uuno is forced to complete his mandatory military service when it is revealed that he only spent one day in the army in his youth. As is typical of the Turhapuro series his family and friends become closely tied in with these events. His friends Härski Hartikainen and Sörsselssön return to the army for a refresher course and by chance Uuno's father-in-law, Councillor Tuura is made the Finnish Defence Minister. In one of the most memorable scenes, Uuno's wife, Elisabeth, dresses as Uuno and substitutes him for a day as Uuno has an apparently urgent meeting (at a restaurant) and while becoming lost in the woods with a malfunctioning radio, Tuura accidentally declares war on Sweden.

Based on Franz Kafka's famous novel, director Jaakko Pakkasvirta created this interpretation of the woebegone Josef K., who is trapped in an ever-increasing labyrinth of double talk and bureaucratic nonsense in his efforts to reach the castle. As Josef seeks to make an appointment to see the ruler Herr Klamm inside his inaccessible abode, he becomes enmeshed in abuse from lowly villagers and bureaucrats alike. His endless false starts toward the castle's enigmatic interior are partly offset by a few sexual encounters but nothing alleviates his role as a victim of forces beyond his control.