- Author: Mrs. H. D. Everett Author Record # 20578
- Legal Name: Everett, Henrietta Dorothy
- Birthplace: Gillingham, Kent, England, UK
- Birthdate: January 1851
- Deathdate: 16 September 1923
- Language: English
- Webpages: Encyclopedia of Fantasy, Library of Congress, Wikipedia-EN, WorldCat
- Used These Alternate Names: Theo. Douglas, Mrs. Everett, Henrietta D. Everett, H. D. Everett
- Note: British writer born as Henrietta Dorothy Huskisson and known primarily as Theo Douglas; "At least half her 22 novels had fantasy and supernatural content." --Encyclopedia of Fantasy
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Novels
- Iras; a Mystery (1896)
- Iras; a Mystery (1896) with Theo. Douglas
- Malevola (1914)
- The Crimson Blind & Other Stories (2006)
- The Crimson Blind & Other Stories (2006) with H. D. Everett
- The Death-Mask and Other Ghosts (1920)
- A Girl in White (1920)
- A Girl in White (2006) with H. D. Everett
- A Perplexing Case (1920)
- A Perplexing Case (2006) with H. D. Everett
- A Water Witch (1920)
- A Water Witch (2006) with H. D. Everett
- Anne's Little Ghost (1920)
- Anne's Little Ghost (1920) with H. D. Everett
- Beyond the Pale (1920)
- Beyond the Pale (2006) with H. D. Everett
- Fingers of a Hand (1920)
- Fingers of a Hand (1998) with H. D. Everett
- Le cornamuse di Mallory [Italian] (1991) with Theo. Douglas
- Nevill Nugent's Legacy (1920)
- Nevill Nugent's Legacy (2006) with H. D. Everett
- Over the Wires (1920)
- Over the Wires (2006) with H. D. Everett
- Parson Clench (1920)
- Parson Clench (2006) with H. D. Everett
- The Crimson Blind (1920)
- The Crimson Blind (1932) with Mrs. Everett
- The Crimson Blind (1987) with Henrietta D. Everett
- The Crimson Blind (2006) with H. D. Everett
- The Death Mask (1920)
- The Death Mask (1932) with Mrs. Everett
- The Death Mask (2006) with H. D. Everett
- The Death-Mask (2016)
- The Lonely Road (1920)
- The Lonely Road (2006) with H. D. Everett
- The Next Heir (1920)
- The Next Heir (2006) with H. D. Everett
- The Pipers of Mallory (1917)
- The Pipers of Mallory (1918) with Theo. Douglas
- The Pipers of Mallory (2006) with H. D. Everett
- The Whispering Wall (1916)
- The Whispering Wall (2006) with H. D. Everett
- The Wind of Dunowe (1920)
- The Wind of Dunowe (2006) with H. D. Everett