The "Divergent" trilogy consists of "Divergent" (2011), "Insurgent" (2012) and "Allegiant", a science fiction novel for young adults, written by what American author?
Veronica Roth
Allegiant (novel)
Allegiant is a science fiction novel for young adults, written by the American author Veronica Roth and published by HarperCollins in October 2013.
 It completes the "Divergent" trilogy that Roth started with her debut novel "Divergent" in 2011.
 The book is written from the perspective of both Beatrice (Tris) and Tobias (Four).
 Following the revelations of the previous novel, they journey past the city's boundaries to discover what lies beyond.
Divergent trilogy
The "Divergent" trilogy is a series of young adult science fiction adventure novels by American novelist Veronica Roth set in a post-apocalyptic dystopian Chicago.
 The trilogy consists of "Divergent" (2011), "Insurgent" (2012) and "Allegiant" (2013).
 A related book, "Four", presents a series of short stories told from the perspective of one of the trilogy's characters.
Veronica Roth
Veronica Anne Roth (born August 19, 1988) is an American novelist and short story writer, known for her debut New York Times bestselling "Divergent" trilogy, consisting of "Divergent", "Insurgent", and "Allegiant"; and "".
 "Divergent" was the recipient of the Goodreads Favorite Book of 2011 and the 2012 winner for Best Young Adult Fantasy & Science Fiction. The Divergent Series: Insurgent
The Divergent Series: Insurgent (also known simply as Insurgent) is a 2015 American science fiction action film directed by Robert Schwentke, based on "Insurgent", the second book in the "Divergent" trilogy by Veronica Roth.
 It is the sequel to the 2014 film "Divergent" and the second installment in "The Divergent Series", produced by Lucy Fisher, Pouya Shabazian and Douglas Wick, with a screenplay by Brian Duffield, Akiva Goldsman and Mark Bomback.
 Schwentke took over from Neil Burger as director, with Burger serving as the executive producer of the film.
 Along with the first film's returning cast, led by Shailene Woodley and Theo James, the sequel features supporting actors Octavia Spencer, Naomi Watts, Suki Waterhouse, Rosa Salazar, Daniel Dae Kim, Jonny Weston, Emjay Anthony, and Keiynan Lonsdale. Insurgent (novel)
Insurgent is a 2012 science fiction young adult novel by American novelist Veronica Roth and the second book in the "Divergent" trilogy.
 As the sequel to the 2011 bestseller "Divergent", it continues the story of Tris Prior and the dystopian post-apocalyptic version of Chicago.
 Following the events of the previous novel, a war now looms as conflict between the factions and their ideologies grows.
 While trying to save the people that she loves, Tris faces questions of grief, forgiveness, identity, loyalty, politics, and love. The Divergent Series
The Divergent Series is a feature film series based on the "Divergent" novels by the American author Veronica Roth.
 Distributed by Summit Entertainment and Lionsgate Films, the series consists of four science fiction films set in a dystopian society.
 They have been produced by Lucy Fisher, Pouya Shabazian, and Douglas Wick and star Shailene Woodley and Theo James as lead characters Beatrice Prior (Tris) and Tobias Eaton (Four), respectively.
 The supporting cast includes Ansel Elgort, Zoë Kravitz, and Miles Teller.
 The first film in the series was directed by Neil Burger, while the second and third films were directed by Robert Schwentke. Singularity (Sleator novel)
Singularity, published in 1985 by E. P. Dutton, is a science fiction novel for young adults written by William Sleator.
 It was listed as a YALSA Best Book for Young Adults, a Junior Library Guild Selection, and was a Colorado Blue Spruce Young Adult Book Award Nominee. Divergent (novel)
Divergent is the debut novel of American novelist Veronica Roth, published by HarperCollins Children's Books in 2011.
 The novel is the first of the Divergent trilogy, a series of young adult dystopian novels set in the Divergent Universe.
 The novel "Divergent" features a post-apocalyptic version of Chicago and follows Beatrice "Tris" Prior as she explores her identity within a society that defines its citizens by their social and personality-related affiliation with five factions, which removes the threat of anyone exercising independent will and re-threatening the population's safety.
 Underlying the action and dystopian focused main plot is a romantic subplot between Tris and one of her instructors in the Dauntless faction, nicknamed Four. Dragonsong
Dragonsong is a science fiction novel by the American-Irish author Anne McCaffrey.
 Released by Atheneum Books in March 1976, it was the third to appear in the "Dragonriders of Pern" series by Anne or her son Todd McCaffrey.
 In its time, however, "Dragonsong" brought the fictional planet Pern to a new publisher, editor, and target audience of young adults, and soon became the first book in the "Harper Hall of Pern" trilogy.
 The original "Dragonriders of Pern" trilogy with Ballantine Books was not completed until after the publication of "Dragonsong" and its sequel. E. Rose Sabin
Elenora Rose Sabin (E. Rose Sabin) is an author of fantasy and science fiction novels for adults and young adults, the most notable being "A School for Sorcery", which is set in an invented world in a country called Arucadi.
 That novel in manuscript form in 1992 won the Andre Norton Gryphon Award for the best unpublished manuscript by a new woman fantasy writer.
 Her other works include "A Perilous Power", the prequel to "A School for Sorcery", and "When the Beast Ravens", the sequel to "A School for Sorcery", all published in hardcover as Tor Books and in trade paperback as Starscape Books by Tom Doherty Associates, LLC.
 An adult science fiction novel titled "Shadow of a Demon" is published in ebook format and as a trade paperback by Double Dragon Publishing.