Sweden 1958. In a small provincial town there is a band who plays dance music twice every week. All decisions are made by Sven Klang, the undisputed leader of the band. A new member joins them, saxophone player Lasse. He starts to criticize Sven's decisions, questions the way they divide the money and he also wants them to be more of a jazz band.

A famous industrialist is murdered at a restaurant in Malmoe. Police inspector Martin Beck in Stockholm gets the case. The suspects lead to people involved in illegal arms deals. But who was the biggest criminal, the murderer or the industrialist?

It's time for Jonsson to return to his old regiment to rehearse what he learned during conscription a few years ago. He meets his old friends, platoon leader Larsson and the music loving captain 'Beethoven'. Jonsson and his comrades doesn't take it very serious - but they have a jolly good time. A female journalist follows the exercise to write an article, and gets interested in him.

1993 film by Daniel Alfredson