The Great God Pan by Arthur Machen
Arthur Machen was a Welsh author and mystic of the late 19th and early 20th century. He is best known for his influential supernatural, fantasy, and horror fiction. Perhaps inspired by Elizabeth Barrett Browning’s poem, in which the first line of every stanza ends “… the great god Pan.”, Machen’s story was one of many to incorporate the Greek god as a symbol of paganism and the power of nature. Because of its decadent style and sexual content, the novella received a scathing condemnation when it was initially published, although it has since become recognized as a cult horror classic. Stephen King has called it “Maybe the best {horror story} in the English language.”