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. The book was provided with a 'soundtrack' by Duncan's longtime friend Stephen Coates and his band The Real Tuesday Weld a cross platform collaboration repeated for Duncan's book 'The Last Werewolf'. The pair have toured and performed at various live events and festivals together including at the British Film Institute.
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." 
In 2013, Glen Duncan took the pseudonym of Saul Black to publish a thriller, The Killing Lessons, in 2015.  As Black, he's also published Anything for You (2019).
- 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)
- The Killing Lessons (2015)
- Lovemurder (2016)
- British Council. "Glen Duncan | British Council Literature". Contemporarywriters.com. Archived from the original on 2010-12-16. 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.
- Lisa Campbell (2013-10-11). "Killing Lessons' author revealed Glenn Duncan". London: The Book Seller. Retrieved 2016-08-12.
- "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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