Arthur is thrilled, because this night is the end of the tenth lunar cycle and he will be able to return to the land of Minimoys to reunite with Selenia. All the villagers are already waiting for him. But it is that day that Arthur’s father announces that their holidays are coming to an end. They were about to leave, when suddenly a spider gives Arthur a drawing with S.O.S letters on it. There is no doubt that Selenia is in danger! Arthur immediately hurries to her rescue, despite the troops of the new tyrant of the Seven Kingdom. He has to save Betameche, fight with rats, grogs and hairy spiders only to find out that nobody was asking for his help! But who could prepare such a trap for the young hero?