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For centuries, a mysterious syndicate known as the Thirteen has staged a silent coup, infiltrating governments and manipulating the course of world events. It's more powerful than any nation, deadlier than any army. The time has come for it to emerge from the shadows and claim the entire world as its own. And only FBI Special Agent James Mason and his longtime friends stand in its way.After narrowly preventing a global pandemic, Mason and his team discover an even deadlier threat has already been set into motion. An unknown adversary has produced enough of a lethal nerve gas to wipe every major city off the face of the world, and their only clue to finding it lies in a cryptic message written in the blood of a man found entombed behind a concrete wall.