Sandstorm: A Sigma Force Novel (Sigma Force Novels Book 1)

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

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

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

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

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

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

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

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

The Seventh Plague: A Sigma Force Novel (Sigma Force Novels Book 12)

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