The Haunting Of Hill House by Shirley Jackson

Hill House is an eighty-year-old mansion in a location that is never specified, built by long-deceased Hugh Crain. The story concerns four main characters: Dr. John Montague, an investigator of the supernatural; Eleanor Vance, a shy young woman who resents having lived as a recluse caring for her demanding invalid mother; Theodora, a flamboyant, bohemian, possibly lesbian artist; and Luke Sanderson, the young heir to Hill House, who is host to the others.
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During the investigation of a reputed “haunted house”, two of the investigating party—Theo, an admitted lesbian, and Eleanor, a lonely, inhibited spinster—go through a curious, subtly delineated relationship wavering, with the intensity of the “haunting” of the house, from attraction to intense love to unexplained revulsion. Macabre.