The Devil Colony: A Sigma Force Novel (Sigma Force Series Book 7)

The Doomsday Key: A Sigma Force Novel (Sigma Force Series Book 6)

Bloodline: A Sigma Force Novel (Sigma Force Series Book 8)

The Eye of God: A Sigma Force Novel (Sigma Force Series Book 9)

The Last Oracle: A Sigma Force Novel (Sigma Force Series Book 5)

The Judas Strain: A Sigma Force Novel (Sigma Force Series Book 4)

Black Order: A Sigma Force Novel (Sigma Force Series Book 3)

The 6th Extinction: A Sigma Force Novel (Sigma Force Series Book 10)

The Skeleton Key: A Short Story Exclusive (Sigma Force Series)

The Bone Labyrinth: A Sigma Force Novel (Sigma Force Series Book 11)

Map of Bones: A Sigma Force Novel (Sigma Force Series Book 2)