Original Series:
1. Stormbreaker (2000)
2. Point Blanc (2001)
3. Skeleton Key (2002)
4. Eagle Strike (2003)
5. Scorpia (2004)
6. Snakehead (2005)
7. Ark Angel (2007)
8. Crooked House (2008)
9. Russian Roulette (2011)
10. Never Say Die (2013)
11. The Beast (2015)
12. The Killing Game (2016)
Recent Additions:
13. Secret Weapon (2019)
14. Nightshade (2020)
15. Freefall (2021)
16. Checkmate (2023)
Spin-offs:
* Scorpia Rising (2010) - A prequel to the main series, featuring a young Scorpia.
* The Falcon (2014) - A standalone story featuring a new character, Jack Strong, who works for MI6.
This list shows the order in which the books were published, which is generally the best order to read them in, as they build upon each other. However, you can read Scorpia Rising after Scorpia if you prefer, as it doesn't spoil anything major in the main series.