A mysterious guest arrives at a remote estate, bringing with him an aura of dread and a hidden agenda. The narrative unfolds within the confines of a decaying manor, where the protagonist, a young man named Able, finds himself increasingly entangled with the enigmatic Mr. Rook. Rook's presence disrupts the fragile peace of the household, hinting at dark secrets and a malevolent force that threatens to consume them all. The story is told through Able's perspective, revealing his growing unease and his attempts to understand the true nature of their unwelcome visitor.

Gene Wolfe's 'An Evil Guest' is recognized as a significant entry in supernatural horror, building upon the intricate storytelling that characterized his earlier works like 'Soldier of Sidon.' Critics often note Wolfe's masterful use of atmosphere and his ability to weave complex narratives that blend the mundane with the terrifying. The novel is praised for its unsettling tone and its exploration of dark themes, appealing to readers who appreciate literary horror with a psychological edge. The reception generally highlights Wolfe's unique voice and his capacity to create a palpable sense of unease and mystery within his fictional worlds.