The Jönsson gang's initial burglary goes awry, and their leader, Sickan, is arrested. After his release from jail, Sickan is recruited by a mysterious banker to steal the renowned Bedford Diamonds in Switzerland. However, he is betrayed and almost caught. Upon returning to Sweden, Sickan seeks revenge against those who wronged him, fueled by a mix of physical and psychological motives.
Varn!ng för Jönssonligan
The Jönsson gang's heist plans go awry, resulting in their leader, Sickan, being arrested and imprisoned for 10 months. Upon his release, Sickan's friends Vanheden and Rocky try to lift his spirits, but find him disinterested in their company.