A sinister group - code-named Zodiac - has launched devastating global attacks. Twelve targets across the world, 12 code-named missions. Operating distinct sleeper cells, they are the ultimate terrorist organisation, watching and waiting for a precise attack to activate the next group. It is 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. On the outer, burned by his former agency, he is determined to clear his name.

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.

Tommy Miller is a man with deadly skills, hiding in Florida under a false identity. After being set up on an overseas mission, he’s on the run from terrorists—and from the government who betrayed him. So when his wife and daughter are violently abducted, it seems his ghosts are finally catching up with him. But Tommy isn’t the only one with secrets. His wife, Teresa, has been concealing her own dangerous past, and as Tommy races to rescue his family, he must peel away the clues she’s left behind.