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.
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.
