While the pirates of Shaigan return with new slaves, one of them, Prince Galathorn, recognizes in Shaigan his old friend Thorgal. The latter, intrigued, decides to know more. But Kriss de Valnor is, for his part, determined not to let him do it. Refugeed at the top of a tower the hero then asks the gods to help him, so he finds himself, after having been "foudroyed", in the company of Frigg the wife of Odin who asks him to go to the land of the giants to recover the ring Draupnir, stolen from the king of the gods, once...