«The Book» by Howard Lovecraft

"The Book" is an unfinished short story by American horror fiction writer H. P. Lovecraft, believed to have been written in late 1933.
In the story fragment, the narrator is given an ancient book by a strange bookseller, and when he takes it home and examines it, weird and sinister events ensue.
In October 1933, Lovecraft wrote in a letter:
I am at a sort of standstill in writing—disgusted at much of my older work, and uncertain as to avenues of improvement. In recent weeks I have done a tremendous amount of experimenting with different styles and perspectives, but have destroyed most of the results.
The H. P. Lovecraft Encyclopedia suggests that "The Book" was one of the undestroyed experiments—an attempt to translate Lovecraft's poem sequence Fungi from Yuggoth into prose. (The completed fragment corresponds to the first three sonnets, which form more of a coherent narrative than the rest of the sequence.)
"The Black Tome of Alsophocus", first published in New Tales of the Cthulhu Mythos (1969), is an attempt by Martin S. Warnes to complete "The Book". Warnes turns the fragment into a tale of possession by Nyarlathotep
Famous works of the author Howard Phillips Lovecraft: At the Mountains of Madness, The Dreams in the Witch House, The Horror at Red Hook, The Shadow Out of Time, The Shadows over Innsmouth, The Alchemist, Reanimator, Ex Oblivione, Azathoth, The Call of Cthulhu, The Cats of Ulthar, The Dunwich Horror, The Doom that Came to Sarnath, The Festival, The Silver Key, The Other Gods, The Outsider, The Temple, The Picture in the House, The Shunned House, The Terrible Old Man, The Tomb, Dagon, From Beyond, What the Moon Brings.