This volume investigates the internal religious experience and symbolic framework of the Mithraic mystery cult as it functioned within the Roman Empire. Roger Beck, a scholar specializing in the study of ancient mystery religions, utilizes a multidisciplinary approach to reconstruct the perspective of the initiate. By integrating the anthropology of religion with cognitive science, the author argues that the cult's complex astral symbolism served as a structured system of meaning for its practitioners, rather than merely a collection of disparate rituals.

Scholars and historians frequently cite this work as a definitive text for understanding the internal logic and symbolic depth of Mithraism. Readers often note the academic density of the prose, which requires a foundational knowledge of Roman history to fully appreciate the author's cognitive approach.