Arthur is thrilled because tonight sees the end of the moon's tenth cycle and he will at last be able to return to the land of the Minimoys. But his father chooses this day to announce that he is cutting short their vacation at Granny's house. As they are about to leave, a spider deposits a grain of rice with an S.O.S. engraved on it in Arthur's hand. There's no doubt: Selenia is in danger!
