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Sigma Force is a 26-book series with 18 primary works first released in 2004 with contributions by James Rollins and Steve Berry.
2004 • 99 Readers • 480 pages • 3.8
2004 • 66 Readers • 560 pages • 4.2
Kowalski's in Love
2006 • 1 Reader • 400 pages
2020 • 10 Readers • 4.5
2006 • 47 Readers • 421 pages • 4.2
2007 • 42 Readers • 4.2
2008 • 40 Readers • 4.4
2009 • 32 Readers • 4
The Skeleton Key
2011 • 19 Readers • 48 pages • 3.9
2011 • 35 Readers • 3.9
2012 • 16 Readers • 67 pages • 4.1
2012 • 36 Readers • 4.1
2013 • 36 Readers • 4.1
The Devil's Bones
2014 • 2 Readers • 4
2014 • 29 Readers • 608 pages • 4
The Midnight Watch
2015 • 10 Readers • 59 pages • 4
2015 • 40 Readers • 688 pages • 3.9
Crash and Burn
2016 • 11 Readers • 54 pages • 3.6
2016 • 27 Readers • 448 pages • 3.9
Ghost Ship
2017 • 9 Readers • 56 pages • 3.8
2017 • 27 Readers • 448 pages • 4.1
2019 • 26 Readers • 3.9
2020 • 24 Readers • 624 pages • 4.1
2021 • 26 Readers • 448 pages • 3.6
2023 • 18 Readers • 448 pages • 4.3
2024 • 10 Readers • 672 pages • 12h • 5