When an orphan boy named Pug is apprenticed to a master magician at a frontier outpost, he inadvertently becomes the catalyst for a war that threatens to consume two distinct worlds. As mysterious invaders breach the Kingdom of the Isles, Pug and his friend Tomas are thrust into a conflict that forces them to abandon their quiet lives. While Tomas discovers a dormant, ancient power within himself, Pug is pulled through a rift in space and time, setting him on a path to master a foreign and volatile form of magic. The narrative follows their divergent paths as they navigate the political and supernatural upheaval of a world on the brink of total collapse.

This work is widely recognized as a foundational entry in the epic fantasy genre, noted for its expansive scope and the classic progression of its central characters. Readers often highlight the effective transition from a small-scale coming-of-age story to a sprawling interdimensional conflict as a key strength of the narrative. The world-building is frequently cited for its depth, particularly the contrast between the medieval-inspired Kingdom of the Isles and the alien culture of the invaders. The novel serves as a standard-bearer for the Riftwar series, establishing the tropes and thematic foundations that define the author's broader body of work.