Den Spanske Flue (The Spanish Fly) is a situation comedy-farce, set in the home of businessman Ludvik Klinke in 1915s Christiania. Struggling to keep his hag of a wife happy, while trying to secure his daughter a nice husband, things are about to get a whole lot worse when a fling from his past turns up on his doorstep. But who is this young lad, who calls him dad?