Anni, the daughter of the Heikkilä family, is forced by her father to give up her plans to marry her beloved farmhand, Matti Väliportti. Anni's life becomes a struggle when her father's choice of husband for her, Toivo Erkkilä, turns out to be a violent alcoholic.
Ilona Jonsson deceives the old industrialist Österberg. He takes pity on the poor girl, who looks like the doppelganger of his dead daughter. Also involved in the plot are Ilona's father, who was supposedly at sea but has just been released from prison, his accomplices Murto-Kalle and...
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.
