First King of Shannara, by Terry Brooks –
Shannara, prequel
Published: 1996
At the Sign of the Crow and Moon
At the Sign of the Crow and Moon, by Mitchell Hogan – Sorcery Ascendant Sequence, prequel Published: 2016
Prequel
Veiled Alliances
Veiled Alliances, by Kevin Anderson – Saga of Seven Suns, prequel Published: 2011
Arcadian Genesis
Arcadian Genesis, by Greig Beck – Alex Hunter, prequel Published: 2012
Blackstar
Blackstar, by N.P. Martin – Ethan Drake Infernal Justice, prequel Published: 2020
Son of Man
Son of Man, by Hayden Pearton – Chronicles of New Eden, prequel Published: 2020
Remembering Siri
Remembering Siri, by Dan Simmons – Hyperion, prequel Published: 1990 in »Prayers to Broken Stones«
The Last Passenger
The Last Passenger, by Charles Finch – Charles Lennox, prequel Published: 2020
First Case
First Case, by Roger Stelljes – McRyan, Prequel Published: 2012
Rune Zero
Rune Zero, by Hugo Huesca – Rune Universe, prequel Published: 2017
The Santini Vendetta
The Santini Vendetta, by Christopher Fox – Kyle MacDonald, prequel Published: 2018
Hidden Courage
Hidden Courage, by Christopher David Petersen – Atlantis, prequel Published: 2011
Karma
Karma, by Walter Mosley – Leonid McGill, prequel Published: 2010
Diablo
Diablo, by Max Hawthorne – Kronos Rising, prequel Published: 2005
Becoming Quinn
Becoming Quinn, by Brett Battles – Jonathan Quinn, prequel Published: 2011
The Bishop’s Pawn
The Bishop’s Pawn, by Steve Berry – Cotton Malone, prequel Published: 2018
The Kill Order
The Kill Order, by James Dashner – Maze Runner, prequel Published: 2012
Island 731
Island 731, by Jeremy Robinson – Nemesis saga, prequel Published: 2013
Forsworn
Forsworn, by Brian McClellan – Powder Mage, prequel Published: 2014
Mountain Man
Mountain Man, by Keith C. Blackmore – Mountain Man, prequel Published: 2017