Title: Demon (novel)
Content:  Demon is a science fiction novel by American writer John Varley, published in 1984. The third and final book in his Gaea Trilogy, it was nominated to the Locus Award.
Title: The Demon (novel)
Content:  The Demon is the third novel by Hubert Selby, Jr., first published in 1976.
Title: Demon Theory
Content:  Demon Theory  is a novel written by Native American author Stephen Graham Jones. Written like a screenplay, it was published in 2006.
Title: Demon (comics)
Content:  Demon is an American supernatural action comic by Jason Shiga. The comic, which follows a man who apparently cannot die, was self-published from 2014 to 2016 as a mini-comic and webcomic, then released as a four-volume 720-page graphic novel by First Second Books in 2016 and 2017. It was unusually well-organized for a webcomic, having been entirely written and laid out before release, with a well-founded story, consistent art, and daily updates. The comic was received favourably by critics, who praised the clever story and its puzzles and plot twists, the artwork which balanced the often grim subject matter, and the surprising humor. The comic won an Eisner Award and an Ignatz Award.
Title: The Demon Spirit
Content:  The Demon Spirit is a fantasy novel by American writer R. A. Salvatore, the second book in the first DemonWars Saga trilogy. It is also the second out of seven books in the combined DemonWars Saga.
Title: The Demon (1978 film)
Content:  The Demon (鬼畜) is a 1978 Japanese psychological drama directed by Yoshitarō Nomura and written by Masato Ide, based on the novel by Seichō Matsumoto.
Title: Demon (album)
Content:  Gazpacho described Demon as "the most complicated and strange album we’ve ever made". It was inspired by "the mad ramblings left behind by an unknown tenant in an apartment in Prague". According to the band, The manuscript contained various ramblings and diagrams which formed the basis of a diary of sorts. The unknown author claimed to have discovered the source of what he called an evil presence in the world. This presence, ‘The Demon,’ was an actual intelligent will, with no mercy and a desire for evil things to happen. The author wrote as if he had lived for thousands of years stalking this presence, and the manuscript included references to outdated branches of mathematics, pagan religions and an eyewitness account of the bubonic plague. The thought of this mysterious figure who had lived through the ages hunting the ‘Demon’ seemed like too good an idea not to write about. Record label Kscope compared Demon to the band's two previous albums, Missa Atropos and March of Ghosts, noting that it continues the band's "tradition of telling rich stories through the course of the album".
Title: Demon's Delight
Content:  Written by Catherine Spangler.
Title: The Demon's Lexicon
Content:  The Demon's Lexicon is a 2009 novel by the Irish author Sarah Rees Brennan. It was published worldwide by Simon & Schuster on June 1, 2009. It is the first in The Demon trilogy, the others being The Demon's Covenant (2010) and The Demon's Surrender (2011).
Title: Demon's Delight
Content:  Written by Emma Holly.

Question: Who is the author of The Demon?
Answer: Hubert Selby Jr.