Question: Radiant Shadows is an Urban fantasy novel, a subgenre of fantasy, by who?
Context: Radiant Shadows is an Urban fantasy novel by Melissa Marr.  It is set in the same universe as Marr's previous YA novels, but is not a sequel to Fragile Eternity; rather, it is a companion novel like Ink Exchange was, focusing on a different set of characters. Lord of Shadows is a young adult urban fantasy novel by Cassandra Clare.  It is the second book in "The Dark Artifices", which is chronologically fourth series in the The Shadowhunter Chronicles.  The book follows the events that occur in the Los Angeles area in 2012, focusing on the residents of the Los Angeles Institute. Anton Strout (born January 24, 1970) is an American urban fantasy author.  He is under contract for four books in his Simon Canderous series, the first of which, "Dead to Me," was published by Ace Books in 2008.  Tim Davis, reviewing that title for Bookloons.com, wrote, "Fans of urban fantasy should especially enjoy Strout's engaging new protagonist and will, no doubt, look forward to Simon Canderous making a quick return in further adventures."  The second novel, "Deader Still," was published in 2009.  The third book, "Dead Matter" was published in 2010 and the fourth, "Dead Waters" was published in 2011. Urban fantasy is a subgenre of fantasy in which the narrative has an urban setting.  Works of urban fantasy are set primarily in the real world and contain aspects of fantasy, such as the arrival of alien races, the discovery of earthbound mythological creatures, coexistence or conflict between humans and paranormal beings, and other changes to city life.  A contemporary setting is not strictly necessary for a work of urban fantasy: works of the genre may also take place in futuristic and historical settings, real or imagined. War for the Oaks (1987) is a fantasy novel by Emma Bull.  The book tells the story of Eddi McCandry, a rock musician who finds herself unwillingly pulled into the supernatural faerie conflict between good and evil.  "War for the Oaks" is a pioneering work in the subgenre of urban fantasy: although it involves supernatural characters, the setting (Minneapolis) is decidedly real-world. The Paladin is a 1988 fantasy novel by science fiction and fantasy author C. J. Cherryh.  It was published by Baen Books and was nominated for the Locus Award for Best Fantasy Novel in 1989.  The book features no actual magic or supernatural occurrences, and as such it can be considered an example of the low fantasy subgenre of fantasy fiction.  It takes place in a fictional country clearly modeled upon (but by no means identical with) China of the Tang Dynasty. Melissa F. Olson is an American author, primarily in the urban fantasy genre.  She is best known for her "Old World" books, which consist of the Scarlett Bernard trilogy, the Boundary Magic trilogy, several short stories, and a novella.  Her latest work is the third Boundary Magic book, published June 21, 2016.  She is also the author of "Nightshades", a Tor.com novella that is unrelated to her other urban fantasy books.  In addition, Olson has published a P.I. mystery with no fantasy elements called "The Big Keep". Contemporary fantasy, also known as modern fantasy or "indigenous fantasy", is a subgenre of fantasy, set in the present day or, more accurately, the time period of the maker.  It is perhaps most popular for its subgenre, urban fantasy. Darkest Mercy is an Urban fantasy novel by Melissa Marr.  It is set in the same universe as Marr's previous YA novels, but is not a sequel to Radiant Shadows; rather, it is a companion novel like Ink Exchange was, focusing on a different set of characters. Son of the Shadows is an historical fantasy novel by Juliet Marillier and the second book in the Sevenwaters Trilogy first published in 2000.  It follows the path of Sorcha and Red's third child, Liadan, a girl who lives outside the pattern of the 'Fair Folk', also known as Túatha Dé Danann.  "Son of the Shadows" won the 2001 Aurealis Awards for Fantasy Novel.
Answer: Melissa Marr