Sigma Force Series
(24 books)


Books in the series:
1.  
Sandstorm (2004)

2.  
Map of Bones (2005)

3.  
Kowalski's in Love (2006)
* (Short Story)

4.  
Black Order (2006)

5.  
The Judas Strain (2007)

6.  
The Last Oracle (2008)

7.  
The Doomsday Key (2009)

8.  
The Skeleton Key (2011)
* (Short Story)

9.  
The Devil Colony (2010)

10.  
Tracker (2012)
* (Short Story)

11.  
Bloodline (2012)

12.  
The Eye of God (2013)

13.  
The 6th Extinction (2014)

14.  
The Midnight Watch (2015)
* (Short Story)

15.  
The Bone Labyrinth (2015)

16.  
Crash and Burn (2016)
* (Short Story)

17.  
The Seventh Plague (2016)

18.  
Ghost Ship (2017)
* (Short Story)

19.  
The Demon Crown (2017)

20.  
Crucible (2019)

21.  
The Last Odyssey (2020)

22.  
Kingdom of Bones (2021)

23.  
Tides of Fire (2024)

24.  
Arkangel (2024)