After his family is displaced from their ancestral lands in the Orkneys, young Murdo Ranulfson embarks on a perilous quest to the Holy Land to retrieve his father and brothers. Driven by the necessity of reclaiming his home, Murdo navigates the brutal realities of the First Crusade, facing both the physical dangers of warfare and the complex political machinations of the era. The narrative employs a dual-timeline structure, alternating between Murdo’s harrowing experiences in the 11th century and a framing device set in the late 19th century involving a secret religious order. This framework highlights the contrast between the spiritual traditions of the Célé Dé monks and the institutional corruption of the medieval Catholic Church.

This work is regarded as a significant transition for the author from mythological fantasy into grounded historical fiction. Critics often highlight the author's ability to capture the atmosphere of medieval Europe with a level of detail that distinguishes his prose from many contemporaries. The inclusion of the Célé Dé spiritual perspective provides a unique thematic layer that separates the narrative from standard accounts of the Crusades. Readers generally appreciate the balance between the visceral depiction of historical conflict and the introspective nature of the protagonist's personal quest.