In 1990 Duncan moved to London, where he worked as a bookseller for four years, writing in his spare time. In 1994 he visited India with his father (part roots odyssey, part research for a later work, The Bloodstone Papers) before continuing on to the United States, where he spent several months travelling the country by Amtrak train, writing much of what would become his first novel, Hope, published to critical acclaim on both sides of the Atlantic in 1997.
His novel I, Lucifer was published in 2002. The premise of the book is that Lucifer has been given a month to live in mortal form to get himself back into God's good graces before the end of the world. The film rights have been sold, and actors such as Ewan McGregor, Jason Brescia, Jude Law, Vin Diesel, and Daniel Craig have been considered for roles in the forthcoming adaptation.
According to critic William Skidelsky in The Guardian, Duncan "specialises in writing novels that can't easily be pigeon-holed." Similarly, David Robson in The Telegraph has noted that Duncan is "an idiosyncratic talent", adding,"You never know quite which way he is going to turn." 
- Hope (1997)
- Love Remains (2000)
- I, Lucifer (2002)
- Weathercock (2003)
- Death of an Ordinary Man (2004)
- The Bloodstone Papers (2006)
- A Day And A Night And A Day (2009)
- The Last Werewolf (April 2011)
- Talulla Rising (June 2012)
- By Blood We Live (February 2014)
- British Council. "Glen Duncan | British Council Literature". Contemporarywriters.com. Retrieved 2011-10-30.
- Duncan, Glen (2007-11-18). "Lives - India - New York Times". India;London (England): Nytimes.com. Retrieved 2011-10-30.
- William Skidelsky (2009-03-15). "William Skidelsky meets Glen Duncan, the man in black | Books | The Observer". London: Guardian. Retrieved 2011-10-30.
- Books (2004-08-01). "Funeral wrongs". London: Telegraph. Retrieved 2011-10-30.
- "Young Man Behaving Badly", New York Times Magazine, November 18, 2007.
- "INTERVIEW W/ GLEN DUNCAN", Scene Missing, November 16, 2004.
- Feature on Duncan's novel The Bloodstone Papers, The Times
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