A painting called "Portrait of Doctor Gachet" was stolen one night in a museum. Immediately, the news of the event warn our heroes who go after some clue that leads them to the thief. After traveling across some countries following their trail, they realize that behind the theft there is a network of smugglers, led by minister Goring, who, among his loot contains a huge amount of stolen from private collectors, with the intention of transporting the paintings and hiding beyond its borders.