Armas J. Pulla

Sergeant Kalle Ryhmy, Second Lieutenant Ville Romppainen, and Mörökölli the cat travel from the front lines to Helsinki for a vacation. The trio, traveling by train, rescue the mysterious beauty Dora and Argentine war reporter Santa Rosa from a snowdrift, who lead them on the trail of an international spy ring hunting for military secrets.

Väinö Kehkonen, the head of a Helsinki-based construction company, takes his wife and the Ärmälä couple to Dr. Puosu for a rejuvenating hormone injection, which causes them to behave like children. The director, previously known for his lack of drive, gains energy and enthusiasm from the injection, both in his business and personal life.

During the Helsinki Olympics, Sotajermut Ryhmä and Romppainen are Olympic coaches. When Delila, coached by Romppainen, is robbed, a series of events begins, involving secret plots, fights, and even tenderness.

Second Lieutenant Romppainen and Sergeant Ryhmä are tasked with blowing up the enemy's ammunition depot. They surrender themselves as prisoners in order to easily reach the Russian side. The resourceful friends and their cat Mörökölli cause all sorts of trouble, especially for the tough female commissar Vengrovska, who is more of a pretty opponent than a scary one.