She lived in Greenwich, Connecticut and died in 2009, aged 88.

Many of her books were about ghosts, but she also compiled mysteries and fantasy, plus anthologies for teens.

https://www.goodreads.com/author/list/810453.Seon_Manley
(reader reviews)

One four-star review, about "Ladies of Horror" (the book includes stories by Shirley Jackson and Daphne du Maurier):

"As a compilation of scary stories, this one pleases more than usual. There's little lame filler, the bane of any anthology-- in the few cases where the supernatural aspect is ambiguous, as is the case in "The Yellow Wallpaper" and "The Lovely House",
the ambiguity is part of the art rather than an infuriating Scooby Doo-esque cop-out. There are also some stories and some authors with a long career of seeking out such fiction had not previously uncovered, or to whose work I'd only heard vague
references to, and the novelty was wonderfully exciting. Possibly the weakest story in the thing is the concluding offering from Agatha Christie, which may give some idea of the power of the rest."

https://mcw3cp.wixsite.com/seonmanley
(her site)

To see the covers of anthologies of ghost stories and such, click on "books with Gogo" (her sister).

https://www.google.com/search?q=seon+manley+books&rlz=1CAJMBU_enUS934US934&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiOnuaM24ruAhUzEVkFHe6UBdwQ_AUoAXoECAUQAw&biw=1100&bih=625
(more covers)

WORKS:
WRITINGS BY THE AUTHOR:

Adventures in Making: The Romance of Crafts Around the World, Vanguard, 1959.

Rudyard Kipling, Creative Adventurer, Vanguard, 1965.
Long Island Discovery: An Adventure Into the History, Manners, and Mores of America's Front Porch, Doubleday, 1966.
My Heart's in the Heather (autobiography), Funk & Wagnalls, 1968.
Nathaniel Hawthorne: Captain of Imagination, Vanguard, 1968.
(With husband, Robert Manley) Beachers: Their Lives, Legends, and Lore, Chilton, 1968.
My Heart's in Greenwich Village (autobiography), Funk & Wagnalls, 1969.

(With R. Manley) Islands: Their Lives, Legends, and Lore, Chilton, 1970.
(With Susan Belcher) O Those Extraordinary Women; or, The Joys of Literary Lib, Chilton, 1972.
Dorothy and William Wordsworth: The Heart of a Circle of Friends, Vanguard, 1974.
The Ghost in the Far Garden, and Other Stories, Lothrop, 1977.
(Compiler with Gogo Lewis) Christmas Ghosts: An Anthology, Doubleday (Garden City, NY), 1978.
(Compiler with Lewis) Masters of Shades and Shadows: An Anthology of Great Ghost Stories, Doubleday (Garden City, NY), 1978.
(Compiler and author of introduction with Lewis) Nature's Revenge: Eerie Stories of Revolt Against the Human Race, Lothrop, Lee & Shepard (New York), 1978.
(Compiler with Lewis) Cat Encounters: A Cat-Lover's Anthology, Lothrop, Lee & Shepard Books (New York), 1979.
(Compiler and author of introduction with Lewis) Fun Phantoms: Tales of Ghostly Entertainment, Lothrop, Lee & Shepard Books (New York), 1979.

(Compiler with Lewis) The Haunted Dolls: An Anthology, Doubleday (Garden City, NY), 1980.
A Present for Charles Dickens, Westminster Press (Philadelphia, PA), 1983.


Editor:

James Joyce: Two Decades of Criticism, Vanguard, 1948, reprinted, 1963.

Teen-Age Treasury for Girls, Funk & Wagnalls, 1958.

Teen-Age Treasury of Good Humor, Funk & Wagnalls, 1960.
(With R. Manley) The Age of the Manager: A Treasury of Our Times, Macmillan, 1962.
Editor, with sister Gogo Lewis: Teen-Age Treasury of Our Science World, Funk & Wagnalls, 1961.
Teen-Age Treasury of Imagination and Discovery, Funk & Wagnalls, 1962.
Mystery! A Treasury for Younger Readers, Funk & Wagnalls, 1963.
Teen-Age Treasury of the Arts, Funk & Wagnalls, 1964.
Merriment! A Treasury for Young Readers, Funk & Wagnalls, 1965.
Suspense: A Treasury for Young Adults, Funk & Wagnalls, 1966.
The Oceans: A Treasury of the Sea World, Doubleday, 1967.
Magic: A Treasury for Young Readers, Funk & Wagnalls, 1967.
Polar Secrets: A Treasury of the Arctic and Antarctic, Doubleday, 1968.
High Adventure: A Treasury for Young Adults, Funk & Wagnalls, 1968.
To You With Love: A Treasury of Great Romantic Literature, M. Smith, 1969. Shapes of the Supernatural, Doubleday, 1969.

A Gathering of Ghosts: A Treasury, Funk & Wagnalls, 1970.
Ladies of Horror: Two Centuries of Supernatural Stories by the Gentle Sex, Lothrop, 1971.
Grande Dames of Detection: Two Centuries of Sleuthing Stories by the Gentle Sex, Lothrop, 1973.
Mistresses of Mystery: Two Centuries of Suspense Stories by the Gentle Sex, Lothrop, 1973.
Bewitched Beings: Phantoms, Familiars, and the Possessed in Stories From Two Centuries, Lothrop, 1974.
Baleful Beasts: Great Supernatural Stories of the Animal Kingdom, Lothrop, 1974.
Masters of the Macabre: An Anthology of Mystery, Horror, and Detection, Doubleday, 1975.
Ladies of the Gothics: Tales of Romance and Terror by the Gentle Sex, Lothrop, 1975.
Ladies of Fantasy: Two Centuries of Sinister Stories by the Gentle Sex, Lothrop, 1975.
Sisters of Sorcery: Two Centuries of Witchcraft Stories by the Gentle Sex, Lothrop, 1976.
Women of the Weird: Eerie Stories by the Gentle Sex, Lothrop, 1976.
Ghostly Gentlewomen: Two Centuries of Spectral Stories by the Gentle Sex, Lothrop, 1977.
Masters of Shades and Shadows, Doubleday, 1978.


Lenona.

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