A group of young people gathered on the countryside to celebrate midsummer dancing, drinking and romancing. And some fighting too. Followed by more violence, jealousy and guilt. On the journey home one of the cars the travel in collides with a bus.

Åsa-Nisse and Klabbarparn teach Sjökvisten how to be a secret agent.

The most popular bands in Sweden are travelling from Stockholm to Gothenburg for a pop contest. The problem is that no one has the money needed to get to Gothenburg, and no one wants the other bands to reach the destination. Some of the most popular Swedish bands of the 1960s figures in the movie: Lee Kings, Spotnicks, Ola & The Janglers, Jerry Williams & The Violents, Shanes, Sten & Stanley and Hounds.

Gus and Holger, two students in Uppsala, have problems with the rent. They are waiting for money from their uncle, but instead of money they are reached by the news that he has gone bankrupt.

Åsa-Nisse is visited by cousin Doris from the United States. Nisse, Klabbarparn and Doris will travel to Stockholm, but Nisse and Klabbarparn lose track of Doris, who get into a hands of a Casanova. Nisse and Klabbarparn instead ends up at the Nordic Museum, where Åsa-Nisse turns out to have unexpected qualities in the art of imitating a mannequin. After that they had found each other is Doris robbed and it leads to a wild brawl that it sparkles and sputters on.