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Bert is finally turning 13. After years of waiting, he is finally becoming a teenager. For his birthday, he wants Rebecka from the parallel class, wrapped in shiny foil or jumping out of a cake. The worst thing that can happen in life is a health check, especially if you are 13 years old. Bert, Åke, Klimpen, Torleif, and the other boys in the class sit petrified with fear, waiting for the extremely terrifying Sister Ilse. The class is raising money for a class trip. Bert comes up with an idea—they will organize a gala where Bert's rock band, Heman Hunters, will play. At the same time, Klimpen threatens to perform as a stand-up comedian. Bert's new love is called Nadja Nilsson. Through Torleif, he finds out that she plays the violin, which Bert immediately starts practicing instead of soccer. But what will he become? A violin-playing phantom in love or a celebrated goal scorer?

The first appearance on screen for Bert Ljung, a normal teenager who's diary Swedes have been able to follow in well over ten books now. As in the books, he fights spots, looks for girls, runs his moped, plays with his weird friends Ake and Erik, and a lot of other stuff teenagers are supposed to do.

A gloriously messy dad and his equally unfiltered family cause chaos when they try to fit in with the snobby crowd at their elite new school.

The film is based on a series of immensely popular Swedish children's books, about the boy Bert, who is just hitting puberty and having the usual problems with it. But that's where the usual ends abruptly.