Efter at have tilbragt 10 måneder i spjældet for et mindre indbrud, bliver Sickan presset til at tage job som diamanttyv af en mystisk bankmand.

The movie begins with the Jönsson gang making a minor burglary. It goes wrong and the gang leader, Sickan, gets caught. After he has spent 10 months in jail, Vanheden and Rocky come to welcome him when he's released. But he doesn't take notice of them, and he's picked up by the mysterious banker Wall-Enberg Jr. instead. He wants Sickan to perform a burglary in Switzerland, in order to retrieve the famous Bedford Diamonds. Sickan does this but is fooled by Wall-Enberg and nearly gets caught. When he returns to Sweden and re-unites with his old gang members, he's set on revenge, both physically and psychologically...

Après avoir passé 10 mois en prison pour un petit larcin, Sickan se voit contraint par un mystérieux banquier de reprendre du service et de dérober des diamants.

Sickan spędza 10 miesięcy w więzieniu za drobne włamanie. Gdy wychodzi na wolność, musi pracować jako złodziej diamentów dla tajemniczego bankiera.

După ce a petrecut 10 luni în închisoare pentru un jaf neînsemnat, Sickan este recrutat cu forța ca hoț de diamante în slujba unui bancher misterios.

Kriminalgeniet Charles-Ingvar "Sickan" Jönsson har en genial plan som innefattar ett kassaskåp av märket Franz Jäger, men kuppen misslyckas och han döms till fängelse. Vid frigivningen dyker kumpanerna Vanheden och Rocky upp för att möta "Sickan", men denne har redan blivit hämtad – av finanskungen Wall-Enberg, som vill ha ett kassaskåp öppnat i Schweiz...