Series
Summary
In Washington, D.C., a homeless man takes an assassin's bullet and dies in Commander Gray Pierce's arms. A bloody coin clutched in the dead man's hand--an ancient relic that can be traced back to the Greek Oracle of Delphi--is the key to a conspiracy that dates back to the Cold War and threatens the... Full description
Series: Sigma Force novels
Sandstorm (Volume 1.)
Map of bones: a Sigma Force novel (Volume 2.)
Black order: a Sigma Force novel (Volume 3.)
The Judas strain: a Sigma Force novel (Volume 4.)
The last oracle (Volume 5.)
The doomsday key: a Sigma Force novel (Volume 6.)
The devil colony (Volume 7.)
Bloodline (Volume 8.)
The eye of God (Volume 9.)
The sixth extinction: a Sigma Force novel (Volume 10.)
The bone labyrinth (Volume 11.)
The seventh plague (Volume 12.)
The demon crown: a Sigma Force novel (Volume 13.)
Crucible (Volume 14.)
The last odyssey (Volume 15.)
Kingdom of bones (Volume 16.)
Tides of fire (Volume 17.)