When Walter Gilman's studies in mathematics begin to overlap with the forbidden mysteries of elder magic, he takes a room in the "Witch-House," where the strange geometry of the building is said to lead out of our world. But Gilman's decision to live in the accursed place will come with a price, as he begins to have vivid and horrifying dreams of passing through to other realities where his actions are no longer under his control.

H.P. Lovecraft's writing served as the basis for what is now called "The Cthulhu Mythos," a universe created by Lovecraft and subsequent writers—most famously Lovecraft's publisher August Derleth—that centered around the horror of "The Great Old Ones." The Cthulhu Mythos has become influential in popular culture and has inspired numerous books, comics, films, and games and "Dreams in the Witch-House" was adapted for an episode of Showtime's Masters of Horror.

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