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.

Vince Carver left the CIA with a dead friend and a close call. So much for so-called intelligence work. No longer knowing what he was fighting for, Carver switched to the private sector and swore he'd never go back. Armed with the elite skills of a special operator, he now leads a team of security specialists far from the battlefield. But everything changes when his convoy is ambushed on American soil. The three-letter agencies all want a piece of him, and the CIA is front and center.

Army veteran Mason Sharpe's world is turned upside down when his beloved fiancée is killed in a random shooting. Struggling to cope with his grief, Sharpe instinctively heads for the North Carolina town where he and his bride had planned to honeymoon. Alone on a beach, contemplating a future which now seems bleak and empty, he stares into the abyss. But then… A body washes ashore. An investigation begins and the police quickly pronounce an accidental death. But Mason isn't buying it. He believes the man was murdered and someone is trying to cover it up.