"The Lurking Fear" is a story by H. P. Lovecraft in the horror fiction genre. The narrator, hearing tales of a "lurking fear" upon Tempest Mountain in the Catskills, takes two men with him to investigate. They camp inside the deserted Martense mansion as a lightning storm approaches, and feeling strangely drowsy, they all fall asleep. The narrator wakes up to find both his companions missing, and in a flash of lightning sees a demonic shadow cast upon the fireplace chimney from a grotesque monsters like the other one.
Continuing his investigation, the narrator teams up with Arthur Munroe, another journalist. The two find as much information as they can on the mansion and environs, until they find themselves trapped by yet another storm. Bunkered in a small cabin, they witness a bright flash of lightning. Arthur looks out the window to survey the damage. The narrator, curious as to why Arthur is still staring out the window, turns him to find his face chewed off. As the narrator digs open the grave of Jan Martense, he describes the history of the Martense family. Upon reaching the coffin, he continues to dig, and subsequently falls into a subterranean burrow. He crawls along, until he sees two eyes reflecting his torch-light in the darkness. Yet another lightning-strike causes the tunnel to cave in above the beast and the narrator has to dig his way to the surface. He spots a red glare in the distance that he learns was a cabin that the hillside squatters had set alight with one of the beasts inside.
The narrator continues to search for more clues, until it occurs to him that peculiar mounds of earth lead out in lines from the mansion. He finds a burrow entrance in the basement as another storm approaches. Finding a hiding place, he watches as countless creatures crawl from the hole. The narrator then sees one of the weaker members of the grotesque mob get attacked and eaten by one of its compatriots. He shoots one of the creatures as it straggles behind the rest of the pack using a clap of thunder to disguise the muzzle blast, and upon closer inspection, notices the creature's heterochromia and realizes that the deformed, hair-covered creature is in fact a member of the Martense family, who after many years of isolation have degenerated into apelike creatures.
