Publisher: Little, Brown & Company

Reading Age: Fiction

1. The Gray Man

2. On Target

3. Sierra Six

4. Armored

To those who lurk in the shadows, he's known as the Gray Man. He is 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. Forces like money. And power. And there are men who hold these as the only currency worth fighting for. In their eyes, Gentry has just outlived his usefulness.

But Court Gentry is going to prove that, for him, there's no grey area between killing for a living and killing to stay alive...

Four years ago, Court Gentry was betrayed by his handlers in the CIA. To survive, he has to eliminate his own brothers in arms. Now, as a master assassin known as the Gray Man, he makes his living killing other people. But when an old comrade he thought dead returns to haunt him, his own life is put in the crosshairs.

The man wants Court to complete a mission - but instead of an assassination, the job will entail a nearly impossible kidnapping - and Court must return his quarry to the very CIA team that turned on him...

Before he was the Gray Man, Court Gentry was Sierra Six, the junior member of a CIA action team.

In their first mission they took out a terrorist leader, but at a terrible price - the life of a woman Court cared for. Years have passed and now The Gray Man is on a simple mission when he sees a ghost: the long-dead terrorist, but he's remarkably energetic for a dead man.

A decade may have gone by but the Gray Man hasn't changed. He isn't one to leave a job unfinished or a blood debt unpaid.

Joshua Duffy is a Close Protection Agent: a professional bodyguard, one of the world's elite operatives. That is, he was until his last mission in Lebanon, where he lost his lower left leg. Now Josh has to support his family working as a mall cop - for him, purgatory.

A lucky run-in with an old comrade promises to get

Josh back in the field for one last job. The UN is sending a peace mission into the Sierra Made Mountains in Mexico, an area so dangerous it's known as Espinazo del Diablo: The Devil's Spine.

Only a fool would think they could broker peace between the homicidal drug cartels in the region, and only a madman would sign on to keep those fools alive.