The Skeleton Key
The Last Oracle
The Judas Strain
Black Order
Sandstorm
Ghost Ship
The Devil Colony
Subterranean
The Doomsday Key
The 6th Extinction
Bloodline
Jake Ransom and the Howling Sphinx
The Midnight Watch
Map of Bones
The Demon Crown
Deep Fathom
Sigma Guide
Kowalski's in Love
Jake Ransom and the Skull King's Shadow
Excavation
The Seventh Plague
Tracker
Altar of Eden
Unrestricted Access: New and Classic Short Fiction
Indiana Jones and the Kingdom of the Crystal Skull
Crucible
The Eye of God
The Bone Labyrinth
The Last Odyssey: A Thriller
Unrestricted Access
Amazonia
Blood Brothers: A Short Story Exclusive
Map of Bones: A Sigma Force Novel
Tracker (sigma force)
The Skeleton Key (sigma force)
Sigma Force 10 - The Sixth Extinction
Tracker: A Short Story Exclusive
Innocent Blood
Map of Bones sf-2
The Eye of God: A Sigma Force Novel
The Eye of God: A Sigma Force Novel sf-9
The Pit
Indiana Jones and the The Kingdom Of The Crystal Skull
The Last Oracle (2008) sf-5
City of Screams
The Doomsday Key and The Last Oracle with Bonus Excerpts
The Judas Strain sf-4
Blood Infernal
The Demon Crown: A Sigma Force Novel
War Hawk: A Tucker Wayne Novel
SANDSTORM sf-1
Bloodline: A Sigma Force Novel
Amazonia: a novel
The Last Oracle: A Sigma Force Novel
City of Screams (the order of the sanguines)
Ghost Ship: A Sigma Force Short Story
The Doomsday Key: A Sigma Force Novel