Ulpius Felix, by Griff Hosker –
Warrior of Rome
Sword of Cartimandua, prequel
Published: 2013
Remo
Remo, by Warren Murphy – Co-authors Richard Sapir and Christopher Wood The Adventure Begins… The Destroyer, prequel Published: 1985
Prequel
Sword of Destiny
Sword of Destiny, by Andrzej Sapkowski – The Witcher, prequel 1 Published: 1993
The Kimberley Secret
The Kimberley Secret, by Gabriel Farago – Jack Rogan, a late prequel Published: 2018
The Hunter
The Hunter, by Chris Carter – Robert Hunter, prequel Published: 2013
Rock Point
Rock Point, by Carla Neggers – Sharpe & Donovan, prequel Published: 2013
Angels in the Moonlight
Angels in the Moonlight, by Caimh McDonnell – Dublin Trilogy, prequel one Published: 2017
Origins
Origins, by Steve Alten – MEG, prequel Published: 2011
Prime
Prime, by Jeremy Robinson – Co-author Sean Ellis Jack Sigler, prequel Published: 2012
One Foggy Night
One Foggy Night, by Jake Bible – Dead Mech-Apex, prequel Published: 2013
The Papua Incident
The Papua Incident, by Urcelia Teixeira – Alex Hunt, prequel Published: 2018
The Ranger Objective
The Ranger Objective, by Jason Kasper – David Rivers, prequel Published: 2016
The Lost Canvas
The Lost Canvas, by Ernest Dempsey – Sean Wyatt, prequel Published: 2012
Guardian of the Dawn
Guardian of the Dawn, by William King – Kormak Saga, prequel Published: 2011
Debt of Bones
Debt of Bones, by Terry Goodkind – Sword of Truth, prequel Published: 1998
The Interrogation
The Interrogation, by Ethan Jones – Justin Hall, prequel Published: 2013
The Abducted
The Abducted, by Roger Hayden – [pseudonym of various authors] The Abducted, prequel – Published: 2016
Fall of a Lost Sun
Fall of a Lost Sun, by Riley Morrison – Caverns of Stelemia, prequel Published: 2018
Crocodile Child
Crocodile Child, by Graham Wilson – Crocodile Dreaming, prequel 1 Published: 2018