The article deals with the work of Algernon Blackwood, the British classic of horror and science fiction literature. His novels and stories’ central theme is manifestations of another world in everyday life. To analyze Blackwood’s worldview, the author uses the tools of the phenomenology of religion, in particular, Mircea Eliade’s ideas on the sacred and the profane dichotomy and the hierophany; Rudolf Otto’s theory of the numinous; and the phenomenological theories of W.B. Kristensen and G. van der Leeuw.