Two men, who both have tried to commit a suicide, decide to found a "Let's do it together"-suicide association to help the self-destructive people to succeed in their goal. Soon they have a bus load of candidates and together they start a bus tour in order to find a suitable place for the mass suicide.
Uuno Turhapuro's younger brother Peni arrives in Helsinki. Uuno helps his brother in management duties.
Relations between Sweden and Finland come to near breaking point. When further negotiations led by President Mara fail, Sergeant Körmy interferes in the course of events.
New takeover plans and Russian art thief looking for Mannerheim's portraits keep Sergeant Körmy busy.
Uuno disguises as an old man and infiltrates a nursing home for rich old people, where his father-in-law also lives. The ever-hungry Uuno is seduced by the table groaning with food, but as it happens, he never manages to be there at dinnertime. Meanwhile Sörsselssön enters Uuno for a TV competition named This Is My Life, where contestants tell about their life as viewers vote them either to continue or out of the show. The nursing home elderly watch on TV as Uuno tells the show's host his life story.
Sergeant Friman is developing an automatic submarine detector that piques the interest of both, Swedish and Russian spies.
The Minister of Defence asks sergeant Körmy to take part in operation, where the United States and Russia are to hand over their nuclear weapons launch equipment and codes to neutral Finland.
