"The Haunter of the Dark" is a Cthulhu Mythos story by H. P. Lovecraft, first published in the December 1936 issue of Weird Tales Magazine.
The story follows Robert Blake, a curious writer drawn to the shadowy depths of Providence, Rhode Island, where he becomes obsessed with a ruined church shrouded in superstition. Within its crumbling walls lies a relic tied to an unspeakable entity—the so-called Haunter of the Dark—an avatar of Nyarlathotep, one of the central deities of Lovecraft’s Cthulhu Mythos.
As Blake delves deeper into the mystery, he uncovers a legacy of occult worship and the horrifying truth about what lurks in the darkness—an entity that can only move when the lights go out.