Series reading guide · updated 2026
Sigma Force Books in Order
Every Sigma Force book in publication order — 22 in total, spanning 2004–2021.
Publication Order of Sigma Force Books
| # | Title | Year | Get it |
|---|---|---|---|
| 1 |  Sandstorm | 2004 | Amazon US UK |
| 2 |  Map of Bones | 2005 | Amazon US UK |
| 3 | Kowalski's in Love | 2006 | Amazon US UK |
| 4 |  Black Order | 2006 | Amazon US UK |
| 5 |  The Judas Strain | 2007 | Amazon US UK |
| 6 |  The Last Oracle | 2008 | Amazon US UK |
| 7 |  The Doomsday Key | 2009 | Amazon US UK |
| 8 |  The Devil Colony | 2010 | Amazon US UK |
| 9 | The Skeleton Key | 2011 | Amazon US UK |
| 10 |  Bloodline | 2012 | Amazon US UK |
| 11 | Tracker | 2012 | Amazon US UK |
| 12 |  The Eye of God | 2013 | Amazon US UK |
| 13 |  The 6th Extinction | 2014 | Amazon US UK |
| 14 | The Midnight Watch | 2015 | Amazon US UK |
| 15 |  The Bone Labyrinth | 2015 | Amazon US UK |
| 16 | Crash and Burn | 2016 | Amazon US UK |
| 17 |  The Seventh Plague | 2016 | Amazon US UK |
| 18 | Ghost Ship | 2017 | Amazon US UK |
| 19 |  The Demon Crown | 2017 | Amazon US UK |
| 20 |  Crucible | 2018 | Amazon US UK |
| 21 | The Last Odyssey | 2020 | Amazon US UK |
| 22 |  Kingdom of Bones | 2021 | Amazon US UK |
Every title by year All 22, oldest to newest
| # | Title | Year | Get it |
|---|---|---|---|
| 1 | Sandstorm | 2004 | Amazon US UK |
| 2 | Map of Bones | 2005 | Amazon US UK |
| 3 | Kowalski's in Love | 2006 | Amazon US UK |
| 4 | Black Order | 2006 | Amazon US UK |
| 5 | The Judas Strain | 2007 | Amazon US UK |
| 6 | The Last Oracle | 2008 | Amazon US UK |
| 7 | The Doomsday Key | 2009 | Amazon US UK |
| 8 | The Devil Colony | 2010 | Amazon US UK |
| 9 | The Skeleton Key | 2011 | Amazon US UK |
| 10 | Bloodline | 2012 | Amazon US UK |
| 11 | Tracker | 2012 | Amazon US UK |
| 12 | The Eye of God | 2013 | Amazon US UK |
| 13 | The 6th Extinction | 2014 | Amazon US UK |
| 14 | The Midnight Watch | 2015 | Amazon US UK |
| 15 | The Bone Labyrinth | 2015 | Amazon US UK |
| 16 | Crash and Burn | 2016 | Amazon US UK |
| 17 | The Seventh Plague | 2016 | Amazon US UK |
| 18 | Ghost Ship | 2017 | Amazon US UK |
| 19 | The Demon Crown | 2017 | Amazon US UK |
| 20 | Crucible | 2018 | Amazon US UK |
| 21 | The Last Odyssey | 2020 | Amazon US UK |
| 22 | Kingdom of Bones | 2021 | Amazon US UK |
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