The Patriots #4

Twenty years ago, in a secret laboratory beneath 's desert sands, a team of scientists created the ultimate first-strike weapon: human beings bio-engineered to be walking chemical weapons. Now the first three prototypes have escaped their military confinement and are leaving a trail of rotting corpses across the West! Only agents Zach Donovan and Rocky Boorman can keep them from killing millions more... and threatening the world with a global plague!