The narrative opens with Sir Otto von Trautwangen recovering from a devastating combat where he was falsely branded as a sorcerer and abandoned by his beloved Gabrielle. Broken in spirit and bearing a shattered sword, Otto retreats into the Ardennes forest, where he encounters the sea-monarch Arinbiorn. After discovering that Otto was drugged by malicious witchcraft, Arinbiorn becomes his steadfast ally, vowing to clear his name and help him regain his lost honor.
Moving northward to the wild frontiers of Finland, Otto joins a Christian army fighting pagan hordes. He proves his valor through relentless combat, aided by a magical sword forged by the master craftsman Asmandur. Throughout these campaigns, Otto is haunted by a mysterious double-goer named Ottur, who mirrors his appearance and adds to the psychological burden of his past mistakes. He also discovers that his long-lost mother, Hildiridur, lives as an enigmatic recluse known as the Druda Minnatrost, guarding the region against dark forces.
Parallel storylines follow Gabrielle and Blanchefleur, who are treacherously abducted by the Moorish prince Mutza and taken to Spain. The chivalric knight Sir Folko de Montfaucon launches a daring rescue mission, ultimately clashing with Mutza in a fatal duel that claims Montfaucon's life. Meanwhile, Otto shatters the magical mirror that had long brought misfortune to his family, purging the final vestiges of dark sorcery from his mother's domain.
As the narrative progresses toward its conclusion, Otto receives news of his father's death and grapples with the loss of Gabrielle, whose affections have drifted. Reconciled with his mother and joined by his former rivals, including Sir Heerdegen, Otto prepares to return to Germany. The volume closes on a note of cautious hope, with the knights setting out toward home to face old griefs and new beginnings.
