First published in 1933, "The Dreams in the Witch House" represents H. P. Lovecraft's fusion of mathematical horror with colonial New England folklore. The story follows Walter Gilman, a brilliant mathematics student who rents a room in Arkham's infamous Witch House—where the seventeenth-century witch Keziah Mason vanished after practicing forbidden geometries. As Gilman studies non-Euclidean calculus and correlates it with ancient magical texts, he finds himself pulled into waking nightmares and interdimensional spaces, haunted by the witch's familiar, Brown Jenkin, and Keziah's lingering presence. The narrative explores the terrifying possibility that mathematical knowledge and occult power converge at the boundaries of human sanity and physical reality.