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.

Defense Intelligence Agency operative Matt Drake broke a promise. A promise that cost three people their lives and crippled his best friend. Three months later, he's paralyzed by survivor's guilt and haunted by the memories of the fallen. Matt may have left Syria, but Syria hasn't left him. In the midst of his self-imposed exile, Matt is dragged back into the world of espionage and assets that he tried to forget. A Pakistani scientist working for an ISIS splinter cell has created a terrifying weapon of mass destruction.

Joshua Duffy is a Close Protection Agent — a professional bodyguard — and he's one of the world's elite operatives. That is, he was until his last mission in Lebanon. Against all odds, Josh got his primary out alive, but the cost was high. Josh lost his lower left leg.

CIA black-ops legend Christopher Wren pulls over on a Utah highway after three weeks on the road. An arbitrary decision he's about to regret. A biker gang attacks Wren, leaves him for dead and steals his truck. Now he's going to get it back. From a secret warehouse in the desert. Ringed with fences. Filled with human cages. As the body count mounts and a shocking national conspiracy unearths a connection to Wren's dark past, one thing is for certain. Justice will be done.

In a desperate attempt to prove his innocence, Kaine is forced to rely on two women he barely knows-a country veterinarian who treats his wounds and an IT expert with a dark secret of her own. Kaine must battle his overwhelming guilt, life-threatening injuries and strong moral code as he hunts for the people who turned him into a mass-murderer.