Shadows of Treachery

John French is an award winning script writer, novelist, and games designer. He has written over twenty books over a decade-long career, notably the Ahriman series set in the dystopian far future of Warhammer 40,000, and six novels in the New York Times Bestselling The Horus Heresy series, most recently The Solar War and Mortis. His other work includes cosmic horror in the Lord of Nightmares Trilogy from Fantasy Flight Publishing, and detective fiction in The Last Visitor in Further Associates of Sherlock Holmes from Titan Books (writing as Stephen Henry). He has been a series writer for three animated TV shows and written the scripts for over thirty produced episodes. In the realm of video games, he has worked as a story designer and writer on multiple titles, including Darktide and the forthcoming Dawn of War IV. In 2018 he won a Scribe Award for Best Audio with his script for the drama Agent of the Throne: Blood and Lies.

Graham McNeill worked for Games Workshop between 2000 and 2006 as a games developer and a background material writer. As well as writing for White Dwarf, he worked on several codexes including the Tau, Necrons, Witch Hunters, Space Marines and Black Templars. After leaving Games Workshop in 2006 he became a freelance writer, but currently continues to produce novels for Black Library His Horus Heresy novel, A Thousand Sons, was a New York Times bestseller, and the second book in his Sigmar trilogy, Empire, won the 2010 David Gemmell Legend Award for best fantasy novel.

Dan Abnett (born 12 October 1965) is an English comic book writer and novelist. He has been a frequent collaborator with fellow writer Andy Lanning, and is known for his work on books for both Marvel Comics, and their UK imprint, Marvel UK, since the 1990s, and also 2000 AD. He has also contributed to DC Comics titles, and his Warhammer Fantasy and Warhammer 40,000 novels and graphic novels for Games Workshop's Black Library now run to several dozen titles and have sold over two million copies. In 2009 he released his first original fiction novels through Angry Robot books.

Gav Thorpe is a British author, game developer, and former games developer at Games Workshop, best known for his work in the Warhammer and Warhammer 40,000 universes. He has written numerous novels for Black Library, including the Horus Heresy series, and is a New York Times bestselling author. He also won the 2017 David Gemmell Legend Award for his novel Warbeast.

Aaron Dembski-Bowden is a New York Times-bestselling author from Northern Ireland, best known for his work on the Warhammer and Warhammer 40,000 science fiction universes. His notable works include the Horus Heresy novels The First Heretic and The Master of Mankind, as well as the popular Night Lords series and novels such as Spear of the Emperor and Black Legion. He has also written for Riot Games and started his career by writing for friends before moving into video games and RPGs. Since 2022 he has worked as the head of narrative at Games Workshop.