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 Ventti-Ville, a rival criminal gang, and the councilor's relatives, who are guarding their inheritance money.