This light farce chronicles the eventual emancipation of rebellious "Mama's boy" Claes-Henrik (Gosta Ekman), who falls into more than one funny mishap before the apron strings are cut. Prone to practical jokes and intent on making a living as a con artist, Claes-Henrik, who goes by the nickname of "Double H" hits upon a chance to make some easy cash. A porno film producer wants to use his mother's apartment for three days of shooting and will generously pay for its rental. Double H cons Mama (Margaretha Krook) into taking a vacation to visit some relatives, but when they get to the train, a hilarious sequence of misunderstandings leaves Mama at the station in her nightie. Double H ends up in the sleeper compartment without a ticket but with a happy female companion in the upper berth and a bottle of Irish whiskey. Emancipation has to begin somewhere.