* The Man with No Name (2008)
* The Cruelest Month (2009)
* The Secret of the Sands (2011)
* The Darkest Hour (2012)
* The Last Days of the Raj (2014)
* The War Within (2016)
* The Shadow of Empire (2020)
Short Stories
* "The Last Knight" (2010)
* "The Sword and the Flame" (2012)
* "The Dragon and the Serpent" (2013)
* "The Tiger and the Lotus" (2014)
* "The Phoenix and the Moon" (2015)
* "The Horse and the Sparrow" (2016)
* "The Dog and the Cat" (2017)
Non-fiction
* The History of Wales (2015)
* The Celtic Mythos (2017)
* The Age of the Vikings (2019)