1. Sandstorm (2004)
2. Map of Bones: A Sigma Force Novel (2005)
3. Black Order: A Sigma Force Novel (2006)
4. The Judas Strain: A Sigma Force Novel (2007)
5. The Last Oracle: A Sigma Force Novel (2008)
6. The Doomsday Key: A Sigma Force Novel (2009)
8. Bloodline: A Sigma Force Novel (2012)
9. The Eye of God: A Sigma Force Novel (2013)
10. The 6th Extinction: A Sigma Force Novel (2014)
11. The Bone Labyrinth: A Sigma Force Novel (2015)
12. The Seventh Plague: A Sigma Force Novel (2016)
13. The Demon Crown: A Sigma Force Novel (2017)
14. Crucible: A Thriller (2019)
15. The Last Odyssey: A Thriller (2020)
16. Kingdom of Bones: A Thriller (2022)