Map of Bones: A Sigma Force Novel (Sigma Force Series Book 2)
The Last Oracle: A Sigma Force Novel (Sigma Force Series Book 5)
Sandstorm (Sigma Force Novels Book 1)
Black Order: A Sigma Force Novel (Sigma Force Series Book 3)
The Judas Strain: A Sigma Force Novel (Sigma Force Series Book 4)
Bloodline: A Sigma Force Novel (Sigma Force Series Book 8)
The Lost City of the Monkey God: A True Story
The Eye of God: A Sigma Force Novel (Sigma Force Series Book 9)
Altar of Eden