The Olsen Gang is involved in a weapon trade for half a billion. It's their final coup, and Valborg is finally allowed to participate.
An unfaithful servant in the Norwegian Petroleum Directorate tries to sell top secret information to German industry leaders. Egon has a plan to earn money on the transaction himself.
The Olsen Gang has traveled south after the success of their last coup, but there's still someone who hasn't given up catching them.
