Wholesaler Paavo Markkanen faces a month in prison for drunk driving. Accustomed to an easy life, he avoids prison by switching places with his doppelgänger, the vagrant Knip, but ends up having to do strenuous physical training in his place. Meanwhile, Markkanen's new housekeeper Kaisa Kankkunen spends her days enjoying herself with her male friends.
| Actor | Role |
|---|---|
 Sven RelanderPaavo Markkanen / Knippu | Paavo Markkanen / Knippu |
 Elsa TurakainenKaisa Kankkunen | Kaisa Kankkunen |
 Eija KaripääElli Markkanen | Elli Markkanen |
| EEino HaavistoAarne Laine | Aarne Laine |
 Matti LehteläReipas | Reipas |
 Arvi TuomiKalle Kapalo | Kalle Kapalo |
| AAku PeltonenNot listed | Not listed |
 Artturi LaaksoKorpela | Korpela |
| OOili JaatinenMrs. Markkanen | Mrs. Markkanen |
| PPaavo KostiojaNot listed | Not listed |
 Kaarlo SaarnioNot listed | Not listed |
| HHelen MardiNot listed | Not listed |
| LLennart Vaikonpää(uncredited) | (uncredited) |
| OOtto Noro(uncredited) | (uncredited) |
| LLauri Korpela(uncredited) | (uncredited) |
| UUsko Kantola(uncredited) | (uncredited) |