Sigma Force
24 books
1Sandstorm
Published: June 29, 2004
2Map of Bones
Published: April 26, 2005
2.5Kowalski's in Love
Published: June 30, 2006
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3Black Order
Published: June 27, 2006
4The Judas Strain
Published: June 13, 2007
5The Last Oracle
Published: June 24, 2008
6The Doomsday Key
Published: June 23, 2009
6.5The Skeleton Key
Published: May 11, 2011
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7The Devil Colony
Published: June 21, 2011
7.5Tracker
Published: June 5, 2012
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8Bloodline
Published: June 26, 2012
9The Eye of God
Published: June 25, 2013
9.5The Devil's Bones
Published: December 16, 2014
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10The Sixth Extinction
Published: August 12, 2014
10.5The Midnight Watch
Published: November 3, 2015
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11The Bone Labyrinth
Published: December 15, 2015
11.5Crash and Burn
Published: November 15, 2016
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12The Seventh Plague
Published: December 13, 2016
12.5Ghost Ship
Published: October 24, 2017
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13The Demon Crown
Published: December 5, 2017
14Crucible
Published: January 22, 2019
15The Last Odyssey
Published: March 24, 2020
16Kingdom of Bones
Published: April 19, 2022
17Tides of Fire
Published: July 5, 2023
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