Vanheden and Dynamit-Harry attempt to break out Doctor Busé from jail, but end up with Herman Melvin instead. The doctor, now with a mind similar to Sickan's, has devised a plan to rob the Swedish Mint, which Melvin unwittingly carries with him. However, the heist goes awry, and they're left with Polish Zlotys instead of the expected Deutsch-marks. In Poland, they discover that the mafia is eager to get their hands on the money, and an unexpected alliance with Wall-Enberg complicates matters.
The Jonsson Gang's Greatest Robbery
Vanheden and Dynamit-Harry's attempt to rescue Doctor Busé from jail inadvertently lands them with Herman Melvin, a former Swedish Mint employee, who has a plan for a daring heist penned by the doctor himself, now thinking like the cunning Sickan.
