The four Hirvonen brothers live in a dead-end town and run a small business “Hirvonen & Co. – Bootlegged drinks and cocktail snacks” together with their father. When Dad ends up in jail after a tragicomically ending liquor store robbery, the boys are left adrift and deeply in debt to local hoods.

Things are further complicated when Saara, a little girl who literally grew up behind the sofa, moves in with the boys, turning out to be their 10-year-old step-sister. In Saara’s Karaoke welcoming party, the boys discover that Saara has a splendid voice. This gives rise to an idea that leads to a series of muddles and mishaps, as Saara is coached to become the new Superkid, with an eye to winning a considerable sum of money offered as First Prize.