Despite the numerous assaults of Thorkell's allied forces, Jomsborg's fortress remains unobtrusive. Thanks to a secret passage, Thorfinn managed to infiltrate Gudrid, who was held hostage by Floki. But he finds himself facing the enthusiast Garm, who is determined to have his duel to death. Forced to fight, will Thorfinn have to renounce his oath and kill again, under Hild's accuser's gaze? Sigurd, who followed Thorfinn in the fortress to recover his wife, finds himself in the center of the fight when he takes Baldur hostage in force the Jomsvikings to open the door of the fortress to let Thorkell's army enter...