A sinister group—code-named Zodiac—has launched a series of devastating global attacks. Twelve targets across the world, twelve code-named missions. Operating distinct sleeper cells, they are the ultimate terrorist organization, watching and waiting for a precise moment to activate the next group. It’s a frightening and deadly efficient way to stay one step ahead … and cause the most chaos. For ex–CIA operative Jed Walker, chaos is his profession. Burned by his former agency, he is determined to clear his name. Stopping Zodiac is the only way.

Nick Mason has already spent five years inside a maximum security prison when an offer comes that will grant his release 20 years early. He accepts - but the deal comes with a terrible price. Now, back on the streets, Nick Mason has a new house, a new car, money to burn, and a beautiful roommate. He's returned to society, but he's still a prisoner. Whenever his cell phone rings, day or night, Nick must answer it and follow whatever order he is given.

Court Gentry is known as The Gray Man—a legend in the covert realm, moving silently from job to job, accomplishing the impossible, and then fading away. And he always hits his target. But there are forces more lethal than Gentry in the world. And in their eyes, Gentry has just outlived his usefulness. Now, he is going to prove that for him, there's no gray area between killing for a living-and killing to stay alive.

David Rivers is an elite-level assassin. He’s an expert in the art of violence. Honing his skill first as a Ranger, then as a mercenary, and now as a CIA contractor conducting covert action around the world. But in his secluded mountain home in Virginia, David Rivers lives a double life. There, Rivers is known as a caring husband to his new wife and the doting father to his young daughter. Soft targets to his enemies. Half a world away, on a mission to assassinate a foreign operative, Rivers uncovers his worst fear.

Caspian Anderson is a translator for the United Nations—or so he’s led everyone to believe. No one suspects that mild-mannered Caspian, with his baggy clothes and sensible car, is actually an elite assassin for the US government. And that’s just how he wants it. For ten years, Caspian has worked under the code name Elias for Onyx, a black program deep within the Department of Homeland Security. His latest mission takes him to Switzerland to kill a target tied to a human trafficking ring. There, Caspian stumbles onto a web of conspiracies involving high-level political figures.