Chaos.
Pain. 
Death.
The Gray Men have lived among us for centuries. They exist to cause suffering. Now they’ve gathered to strike again, controlling the minds of ordinary citizens and turning them into vicious killers.
For years, The Guild has resisted the Gray Men. Their agents have been waiting for the Gray Men to appear once again. John Marshall is one of these agents. Armed and trained by the Guild, he discovers the Gray Men are gathering followers and preparing to wipe out anyone not on their side.
An explosion set off by followers of the Gray Men begins a chain of violent attacks in John's hometown. John realizes that nowhere is safe as the Gray Men and their followers spread panic and death like a contagious disease. 
John takes his family and goes on the run. As society begins to break down, John must keep his family safe while carrying out his mission to fight the Gray Men.