Lederen af Jönssonligan forlader Stockholm for at mødes med sine kumpaner på det solrige Mallorca, hvor han planlægger sit livs største kup.

Le chef du gang Jönsson quitte Stockholm pour rejoindre ses complices sous le soleil de Majorque, où il prépare le plus grand coup de sa vie.

Vanheden and Dynamit-Harry, together with Harry's fiancée Doris, are in Mallorca while Sickan is still in Stockholm. However, Wall-Enberg talks him into doing a break-in at Las Palmas cathedral in Mallorca. Once persuaded, he can't resist the temptation and travels to Mallorca as well. However, Wall-Enberg obviously can't be trusted. Sickan is framed, caught and put in jail. While being escorted home to Sweden again, Vanheden and Harry sets up a plan to break him free. Sickan, once free, wants payback. The gang discover that an antiques dealer called Germann has something to do with the whole thing and that she's also collaborating with Wall-Enberg. The gang then decide to take a closer look at her and her antiques and they discover that there's a heist being planned against the cathedral in Palma.

Liderul bandei Jönsson pleacă din Stockholm pentru a relua legătura cu asociații săi aflați în însorita Mallorca, unde pune la cale cel mai mare jaf al carierei sale.

För en del av de pengar som Jönssonligan kom över vid den senaste kuppen har Doris införskaffat ett solarium på Mallorca. Dit har också Vanheden och hennes älskade Dynamit-Harry flyttat. Lägenheten i Sverige har Doris hyrt ut till Sickan, som i ett regnigt och grått Stockholm får besök av finanskungen Wall-Enberg, som lockar med en lönsam kupp mot ett kassaskåp på Mallorca.