Lo and behold! The old companions Ragnar Vanheden and Dynamit Harry have decided to become ... Honest! That is why they have started AB Alltjänst (All-service Inc). Of course, Doris works as the company's secretary. One day, Ragnar and Harry are contacted by an elderly lady who offers them a somewhat original assignment: To guard the Royal Opera in Stockholm. However, the old lady has a criminal past. And not only that - She's Sickan's grandmother too! And as if this was not enough, Sickan's little brother, Sven-Ingvar, also stays at his grandmother's house! It turns out that the old arch-villain Wall-Enberg intends to seize the Opera's entire EU contribution in collusion with the resigning Opera director and an Italian accomplice with deep branches in the Sicilian mafia. Now it is up to Jönssonligan - Sorry - "AB Alltjänst" to catch up. And it's in a hurry ... Extremely in a hurry!