24 books in series

Sigma Force

Sigma Force is a 23-book series with 17 primary works first released in 2004 with contributions by James Rollins. The next book is scheduled for release on 8/6/2024.

Sandstorm
#1Popular

2004 • 65 Readers • 608 pages • 3.8

Map of Bones
#2First

2004 • 35 Readers • 560 pages • 4.4

Unrestricted Access: New and Classic Short Fiction
#2.5

2020 • 5 Readers

Black Order
#3

2006 • 24 Readers • 448 pages • 4.3

The Judas Strain
#4

2007 • 23 Readers • 529 pages • 4.6

The Last Oracle
#5

2008 • 18 Readers • 448 pages • 4.5

The Doomsday Key
#6

2009 • 16 Readers • 448 pages • 4.4

Cover 4

The Skeleton Key

#6.5

2011 • 12 Readers • 48 pages • 4

The Devil Colony
#7

2011 • 18 Readers • 480 pages • 4.3

Tracker
#7.5

2012 • 9 Readers • 67 pages • 4.3

Bloodline
#8

2012 • 19 Readers • 464 pages • 4.2

The Eye of God
#9

2013 • 19 Readers • 643 pages • 4.2

The 6th Extinction
#10

2014 • 16 Readers • 608 pages • 4

Cover 1

The Midnight Watch

#10.5

2015 • 6 Readers • 59 pages • 4

The Bone Labyrinth
#11

2015 • 22 Readers • 501 pages • 4.1

Cover 5

Crash and Burn

#11.5

2016 • 8 Readers • 54 pages • 3.5

The Seventh Plague
#12

2016 • 16 Readers • 448 pages • 4

Cover 1

Ghost Ship

#12.5

2017 • 6 Readers • 56 pages • 3.8

The Demon Crown
#13

2017 • 16 Readers • 448 pages • 4.3

Crucible
#14

2019 • 16 Readers • 480 pages • 4.1

The Last Odyssey
#15

2020 • 11 Readers • 624 pages • 4.5

Kingdom of Bones
#16

2021 • 13 Readers • 448 pages • 3.3

Tides of Fire
#17

2023 • 9 Readers • 448 pages • 4.7

Arkangel
#18Unreleased

Available August 6, 2024 • 1 Reader • 672 pages • 12h