An aging recluse living in a remote Irish estate surrounded by desolate, untamed gardens begins experiencing terrifying supernatural phenomena. In Hodgson's harrowing tale, the protagonist witnesses a succession of apocalyptic visions, from a silent plain watched over by ancient mythological deities to hideous, swine-like humanoids that besiege his remote home from a nearby abyss. These grotesque creatures, endowed with a malignant intelligence, attempt to breach his isolated sanctuary while time itself accelerates toward the ultimate death of the solar system. The narrative expands infinitely beyond earthly terrors into staggering cosmic dimensions where the protagonist's disembodied consciousness drifts across dead stars and black nebulae.
Amidst these cold, terrifying expanses of deep time, he glimpses celestial visions and catches fleeting, poignant echoes of a lost love upon the ethereal Sea of Sleep. The book builds a pervasive atmosphere of dread through meticulous, archaic prose that examines the terrifying insignificance of humanity against vast, uncaring cosmic forces. Ultimately, the protagonist returns from his hyper-dimensional voyages only to confront the lingering horrors of his earthly existence and the inevitable, creeping decay of his own mortal shell.