A scientific experiment meant to pierce the veil between ordinary perception and a hidden pagan reality enables one person to perceive an otherworldly presence, and that awakening leads to a series of disturbing transformations and violent outcomes. The narrative is assembled from memoirs, letters, reports, and fragmentary investigations that uncover inexplicable suicides, uncanny encounters, and a compellingly dangerous female figure whose origins trace back to the experiment. Themes include the limits of knowledge, the costs of forbidden inquiry, and the persistent intrusion of archaic, irrational forces into modern life, leaving much unresolved and ominously ambiguous.