Tanja Bulkova arrives in Finland under the name Toini Salonen and, with the help of spy chief Rosenberg, becomes the secretary of engineer Rautavuori and discovers the drawings of a secret invention.

After many mishaps, City Engineer Volmari arrives at the masquerade ball wearing a suit of knight's armor from the museum. He dances with his blind date crush Raili until Bertha, the black singer from the circus, pulls him away and a new whirlwind of misunderstandings begins.

The film takes place in the summer and spring of 1940. Isä, the father, gets involved in the stock market and threatens the livelihood of the family.

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.

Raili moves away from her mean aunts. The young woman enjoys her independent life, but debt, a deceitful boyfriend, and getting fired from her office job get her into trouble. However, Raili's uncle Salomoni and his wife Salli support their relative. Olli, a lawyer, also wants to help Raili, who has fallen victim to blackmail.

At the eve of Crimean war orphaned Regina lives with her grandmother in a small cabin near a lavish villa. As the summer approaches there is great anticipation of a big ball to be held.

Old Virtanen is a respected night watchman at a textile factory and a single father to his daughter Aino, who is about to graduate from high school. The heartless factory owner Kuusela fires Virtanen, who is forced to look for a new job. When Aino, who is in love with the manager's son Veikko, disappears after her graduation party, her father, who has fallen ill with worry, is overcome with despair.

Waste paper collector Mikko dreams of being a wealthy mining engineer who succeeds in all his business ventures. He is also lucky in love when Clas, a factory owner, charming daughter Aune takes a liking to the charming mining engineer.