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The father of the family, Petri Nieminen, excels at his job as a tax official, but cannot cope with the "men's work" in his home. He solves the problem by hiring his opposite - the rough Jaska - as a repairman.

Alarming information is revealed about the tire, such as the fact that it does not have a tax card. Petri gets into moral problems with doing illegal work, while Jaska settles down more and more as a house.

Petri begins to lose his grip as the head of the family as Jaska enjoys work and also the company of Petri's wife Anne. Petri vents his frustration at work, where rumors about Petri's health begin to circulate.

Petri clearly finds himself in a competitive situation where the host and ring are now facing each other. Petri decides to turn into a macho man and takes his repairman by the neck with the help of muscle superiority.

Anne encourages Petri to leave to relax his nerves and help with Aunt Maija's move. While he is away, Petri begins to suspect his wife and Jaska of an insidious secret relationship.

Petri discovers the dormant alpha male in himself and bravely realizes his new self, with the result that Anne no longer recognizes her husband. At the same time, more and more sleazy aspects of Jaska are revealed.