Da den brogede Jönssonligas vovede kupforsøg går i vasken, må lederen forsøge at slippe fra politiet, mens han søger hævn over en ærkefjende.

Sickan, Vanheden and Rocky try to rob the Berns nightclub one night, but Vanheden has made the mistake to invite his constantly drunk cousin, the old dynamiter Dynamite-Harry and he ruins the plan. Sickan is arrested, and has to spend 10 months in a small, locked room. When he is released, he has a new plan, but Rocky and Vanheden have decided to go straight. Together with Dynamite-Harry, Sickan plans to rob a cold store, managed by their arch-enemy, Wall-Enberg.

Lorsque la tentative de cambriolage perpétrée par sa bande de bras cassés déraille, Jönsson cherche à échapper à la police tout en se vengeant d'un ennemi juré.

Po nieudanej próbie napadu na klub nocny przywódca gangu Jönssona musi uciekać przed policją, jednocześnie opracowując plan zemsty na swoim zatwardziałym wrogu.

Încercarea îndrăzneață de jaf a bandei Jönsson scapă rapid de sub control, așa că șeful echipei trebuie acum să se ascundă de poliție și să se răzbune pe rivalul său.

Mästerhjärnan "Sickan" har i vanlig ordning en plan för den perfekta kuppen. Tillsammans med kumpanerna Vanheden och Rocky skall han bryta sig in hos finanskungen Wall-Enberg. Till sin hjälp tar de Dynamit-Harry, men dennes vetskap om dynamit är en smula bedagad, vilket Jönssonligan snart blir varse...