Eager to spend the summer at camp, the young Jönsson gang finds itself instead at a punitive, hardscrabble institution run by their archenemy.

When their circus tickets get swiped, the Jönsson League boys hatch a plan to steal them back, but end up suspects in an even bigger crime!

The young Jönsson gang’s plan to steal “millions of filmisar” faces problem after problem before uncovering something much greater.