It's in the middle of the summer. Sickan, Ragnar and Dynamit- Harry, or the ''Jönsson League'' as they call themselves, has nothing to do until the circus comes to town. Sickan quickly thinks out a plan on how they're going to get tickets. However, after they've got their hands on the tickets, the three friends arch enemy, Junior Wall- Enberg, son of the city's mayor Vigor Wall- Enberg, steals the tickets.