Reddit users have talked about these fiction books more than others.

House of Leaves by Mark Z. Danielewski
How to Read a Book: The Classic Guide to Intelligent Reading (A Touchstone book) by Mortimer J. Adler
Ishmael:A Novel by Daniel Quinn
In the Buddha’s Words: An Anthology of Discourses from the Pali Canon (The Teachings of the Buddha) by Bhikkhu Bodhi
The Lands of Ice and Fire (A Game of Thrones): Maps from King’s Landing to Across the Narrow Sea by George R. R. Martin
BioShock: Rapture by John Shirley
Legends: Stories By The Masters of Modern Fantasy by
The Name of the Wind by Patrick Rothfuss
The Ultimate Hitchhiker’s Guide to the Galaxy by Douglas Adams
World War Z: An Oral History of the Zombie War by Max Brooks
The Redwall Cookbook by Brian Jacques
Wool by Hugh Howey
Do Not Resuscitate by Nicholas Ponticello
The Atlas of Middle-Earth (Revised Edition) by Karen Wynn Fonstad
Penpal by Dathan Auerbach
Snow Crash by Neal Stephenson
Replay by Ken Grimwood
Leviathan Wakes by James S. A. Corey
Moon People by Dale M Courtney
The Last Wish: Introducing The Witcher by Andrzej Sapkowski
Sophie’s World: A Novel About the History of Philosophy (FSG Classics) by Jostein Gaarder
The Curious Incident of the Dog in the Night-Time by Mark Haddon
The Blade Itself (The First Law: Book One) by Joe Abercrombie
Ship of Theseus by Doug Dorst
The Name of the Wind (Kingkiller Chronicles)
The Great Book of Amber: The Complete Amber Chronicles
Flatland: A Romance of Many Dimensions (Dover Thrift Editions) by Edwin A. Abbott
D’Aulaires’ Book of Greek Myths by Ingri d’Aulaire
The Sparrow: A Novel (Ballantine Reader’s Circle) by Mary Doria Russell
Ready Player One by Ernest Cline
American Gods by Neil Gaiman
John Dies at the End by David Wong
The Lies of Locke Lamora (Gentleman Bastards) by Scott Lynch
Dune by Frank Herbert
The Stinky Cheese Man and Other Fairly Stupid Tales by Jon Scieszka
A Game of Thrones / A Clash of Kings / A Storm of Swords / A Feast of Crows / A Dance with Dragons by George R. R. Martin
The Diamond Age: Or A Young Lady's Illustrated Primer
Shantaram: A Novel by Gregory David Roberts
The Call of Cthulhu and Other Weird Stories (Penguin Twentieth-Century Classics) by Howard Phillips Lovecraft
Abraham Lincoln: Vampire Hunter by Seth Grahame-Smith
Kushiel’s Dart by Jacqueline Carey
Stories of Your Life and Others by Ted Chiang
The Alchemist by Paulo Coelho
The Road by Cormac McCarthy
The Book of Jhereg by Steven Brust
Collected Fictions by Jorge Luis Borges
A Knight of the Seven Kingdoms (A Song of Ice and Fire) by George R. R. Martin
The Postmortal by Drew Magary
Ours Is the Storm by D. Thourson Palmer
Feed (Newsflesh)
Sword Art Online 1: Aincrad by Reki Kawahara
The Norse Myths (The Pantheon Fairy Tale and Folklore Library) by Kevin Crossley-Holland
How to Win Friends and Influence People by Dale Carnegie
The Magicians: A Novel (Magicians Trilogy) by Lev Grossman
Fifty Shades of Grey: Book One of the Fifty Shades Trilogy (Fifty Shades of Grey Series) by E L James
Cloud Atlas: A Novel by David Mitchell
Geek Love: A Novel by Katherine Dunn
The Way of Kings by Brandon Sanderson
Pastwatch: The Redemption of Christopher Columbus by Orson Scott Card
Gates of Fire: An Epic Novel of the Battle of Thermopylae by Steven Pressfield
The Lord of the Rings (50th Anniversary Edition) by J.R.R. Tolkien
The Fermata by Nicholson Baker
Machine of Death: A Collection of Stories About People Who Know How They Will Die by
The New Bloomsday Book: A Guide Through Ulysses (Routledge International Studies in) by Harry Blamires
The Haunted Vagina by Carlton Mellick III
The Count of Monte Cristo
(Penguin Classics) by Alexandre Dumas père
Anathem by Neal Stephenson
Infinite Jest by David Foster Wallace
Year Zero: A Novel by Rob Reid
The Illuminatus! Trilogy: The Eye in the Pyramid
Dies the Fire: A Novel of the Change by S. M. Stirling
Hard-Boiled Wonderland and the End of the World: A Novel (Vintage International) by Haruki Murakami
Redshirts: A Novel with Three Codas by John Scalzi
Day by Day Armageddon by J. L. Bourne
Metaphors We Live By by George Lakoff
The Night Circus by Erin Morgenstern
A Game of Thrones (A Song of Ice and Fire) by George RR Martin
A Stitch in Time (Star Trek: Deep Space Nine #27) by Andrew J. Robinson
The Good That Men Do (Star Trek: Enterprise) by Andy Mangels
H. P. Lovecraft: Tales (Library of America) by H. P. Lovecraft
The Eyre Affair: A Thursday Next Novel by Jasper Fforde
The Shadow of the Wind by Carlos Ruiz Zafón
The Brothers Karamazov by Fyodor Dostoevsky
Feminism Is for Everybody: Passionate Politics by bell hooks
Spin by Robert Charles Wilson
Theft of Swords
Aztec by Gary Jennings
The Number Devil: A Mathematical Adventure by Hans Magnus Enzensberger
Battle Royale: The Novel by Koushun Takami
Sex and the Cthulhu Mythos by Bobby Derie
Shades of Grey: A Novel by Jasper Fforde
The Best of H. P. Lovecraft: Bloodcurdling Tales of Horror and the Macabre by H.P. Lovecraft
Earth Abides by George R. Stewart
Star Wars: The Old Republic — Revan (Star Wars: The Old Republic — Legends) by Drew Karpyshyn
We by Yevgeny Zamyatin
Ulysses Annotated: Notes for James Joyce’s Ulysses by Don Gifford
The Lord of the Rings: 50th Anniversary Edition
I Am Legend by Richard Matheson
Leviathan (The Leviathan Trilogy) by Scott Westerfeld