Question: The Return of the Sorcerer ties into the book of magic appearing in stories by which horror writer?
Context: Adam-Troy Castro is a science fiction, fantasy, and horror writer living in Palm Beach County, FL.  He has more than one hundred stories to his credit and has been nominated for numerous awards, including the Hugo, Nebula, and Stoker.  These stories include four "Spider-Man" novels, including the Sinister Six trilogy, and stories involving characters of Andrea Cort, Ernst Vossoff, and Karl Nimmitz.  Castro is also known for his Gustav Gloom series of middle-school novels and has also authored a reference book on "The Amazing Race". Anders Fager (born in Stockholm 1964) is a Swedish horror writer.  After a career as an army officer and game designer he made his debut in 2009 with the short story collection "Swedish Cults" ("Svenska kulter") that received a most favourable review in Swedish newspaper "Dagens Nyheter" and launched Fager's career as full-time writer.  Fager writes modern urban horror in a style he has repeatedly described as ”what would happen if James Ellroy took on H.P. Lovecraft”.  Set in present-day Sweden, his interconnected stories form a modern part of the Cthulhu mythos with entities such as Dagon and Hastur making appearances.  Fager's fictional world, known as "The Cult's World", has been made into a role playing game and is also currently being turned into a graphic novel and a theartrical play. Sekenre: The Book of the Sorcerer is a collection of fantasy short stories written by Darrell Schweitzer featuring his dark fantasy protagonist, the child sorcerer Sekenre, a sequel to the novel "The Mask of the Sorcerer" (1995).  The book was illustrated by Stephen Fabian.  It was first published as a trade paperback by Wildside Press in 2004. The Necronomicon is a fictional grimoire (textbook of magic) appearing in the stories by horror writer H. P. Lovecraft and his followers.  It was first mentioned in Lovecraft's 1924 short story "The Hound", written in 1922, though its purported author, the "Mad Arab" Abdul Alhazred, had been quoted a year earlier in Lovecraft's "The Nameless City".  Among other things, the work contains an account of the Old Ones, their history, and the means for summoning them. The Cthulhu Mythos is a shared fictional universe, based on the work of American horror writer H. P. Lovecraft.  The term was coined by August Derleth, a contemporary correspondent and protégé of Lovecraft's, to identify the settings, tropes, and lore employed by Lovecraft and his literary successors.  The name "Cthulhu" derives from the central creature in Lovecraft's seminal short story, "The Call of Cthulhu", first published in the pulp magazine "Weird Tales" in 1926.  Richard L. Tierney, a writer who also wrote "Mythos" tales, later applied the term "Derleth Mythos" to distinguish Lovecraft's works from Derleth's later stories, which modify key tenets of the "Mythos".  Authors of Lovecraftian horror in particular frequently use elements of the Cthulhu Mythos. "The Return of the Sorcerer" is a horror short story by Clark Ashton Smith, first published in "Strange Tales of Mystery and Terror" in September 1931.  The story ties into H. P. Lovecraft's Cthulhu Mythos due to its references to Lovecraft's invented book of occult lore the "Necronomicon".  It tells of one Dennis William Etchison (born March 30, 1943) is an American writer and editor of fantasy and horror fiction.  Etchison refers to his own work as "rather dark, depressing, almost pathologically inward fiction about the individual in relation to the world".  Stephen King has called Dennis Etchison "one hell of a fiction writer" and he has been called "the most original living horror writer in America" ("The Viking-Penguin Encyclopedia of Horror and the Supernatural").  While he has achieved some acclaim as a novelist, it is his work in the short story format that is especially well-regarded by critics and genre fans.  He was President of Horror Writers Association from 1992 to 1994.  He is a multi-award winner, having won the British Fantasy Award three times for fiction, and the World Fantasy Award for anthologies he edited. Scott Baker (born 1947 in Chicago) is an American science fiction, fantasy, and horror writer.  (Though his middle initial is M., he should not be confused with the horror writer who publishes under the name Scott M. Baker.)  Baker grew up in Wheaton, Illinois, once a stop on the Underground Railroad, but more recently a bastion of evangelical fundamentalism and political conservativism, resistance to which has been one of the dominant influences on his life and writing.  After graduating from New College in Florida, co-owning a leather shop in Provincetown, Massachusetts, and then dropping out of the doctoral program at the UC Irvine, he spent a number of years as a hippy, camping near Tassajarra Zen Center in the Los Padres National Forest and passing much of the rest of his time in various bars.  Forced to the realization that he was not having enough fun as a would-be hedonist to justify the lifestyle, he decided to become a full-time writer.  On the way there he became what may be the only person to hold a Masters of Arts degree in Speculative Fiction (Goddard College).  After 20 years in Paris, where he worked as a publisher's reader for several French publishers and, less artistically, as a financial translator for French brokerage houses, he now lives in Pacific Grove, California.  His first novel, "Symbiote's Crown" ("l'Idiot-roi") received the French "Prix Apollo" award.  This novel was science fiction.  He won a World Fantasy Award for Best Short Fiction in 1985 for "Still Life with Scorpion", and has been nominated for the award three other times.  Baker was co-author of the screenplay for the French film LITAN, which won the "Prix de la Critique" (Critic's Prize) at the Avoriaz Fantastic Film Festival in 1982, and has worked on a number of other French films.  He wrote some of the websites for WHO KILLED EVAN CHANG? , the web tie-in for Steven Spielberg’s film, AI (Warner Brothers, 2001).  He has been a judge for the World Fantasy Award and the Philip K. Dick Award.  Now in semi-retirement, he devotes most of his time to playing tennis, at which he is tenacious but not particularly gifted. Gerald "Jerry" Neal Williamson (April 17, 1932 - December 8, 2005) was an American horror writer and editor known under the name J. N. Williamson.  Born in Indianapolis, Indiana he graduated from Shortridge High School.  He studied journalism at Butler University.  He published his first novel in 1979 and went on to publish more than 40 novels and 150 short stories.  In 2003 he received a lifetime achievement award from the Horror Writers of America.  He edited the critically acclaimed "How to Write Tales of Horror, Fantasy & Science Fiction (1987)" which covered the themes of such writing and cited the writings of such writers as Robert Bloch, Lee Prosser, Richard Matheson, Ray Bradbury, H. P. Lovecraft, August Derleth, William F. Nolan, and Stephen King.  Many important writers in the genre contributed to the book.  Williamson edited the popular anthology series, "Masques".  Some of his novels include "The Ritual (1979)", "Playmates (1982)", "Noonspell (1991)", "The Haunt (1999)", among others. Daydreaming on Company Time was the first collection of stories by Australian horror writer Rob Hood.  The volume includes fantasy tales like the title story and crime tales as well as horror tales of dislocated psyches, all told with a quirky black sense of humour.  It includes the powerful “Juggernaut” (about an inexplicable and destructive Object), as well as strong horror tales like “Last Remains’, and “Necropolis” The book was runner-up for Best Single Author Collection in the 1990 Readercon Imaginative Fiction Awards (USA).
Answer: H. P. Lovecraft