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The Spymaster (Department 89, #18) was the most recently released book by Mark O'Neill, on March 6th, 2026.
Mark O'Neill Stats: The most read book by Mark O'Neill on Book Notification is The Renegade Spy, the first novel in the Department 89 series.
Below is a complete list of Mark O'Neill books in publication and chronological order, broken down by series. The most popular series by Mark O'Neill is the Department 89 Series.
Mark O'Neill was born in Edinburgh,.
Mark O'Neill is the author of the Department 89 series which currently consists of 18 novels. The Department 89 series started in 2017 with the novel The Renegade Spy. The most recently released novel in the Department 89 series was The Spymaster which was released in 2026. There are no upcoming novels for the Department 89 series.
Mark O'Neill has also written The Scorpion series which has 3 books including The Desert Scorpion and The Praetorian Scorpion.
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Home » Authors » Mark O’Neill (Department 89 Series) List of Books
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Written by Kimberley Chambers
Written by C.E. Murphy
Written by Leila James
Written by Aamna Qureshi
Written by Olivia Thorn
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