Synopsis
During the summer a fun fair arrives in the city. All the children want to go there, including members of the Jönsson Gang: Sickan, Harry and Vanheden. The three are however green and must plan a plan to steal hundreds of tickets. Unfortunately, during the operation, their rivals Junior and Biffen took possession of the stolen goods and hid it from Junior's house. At the Jönsson Gang all you have to do is enter the house at night. While retrieving the tickets, they come across three acrobats of the funfair intent on stealing precious paintings from the walls. The Jönsson, trying not to get noticed, flee the house. The next day the police take care of the case and have many traces to follow: all lead to the Jönsson Gang. The three will have to do everything to escape the persecution of the terrible Junior and to bring the true culprits to justice.