When nuclear waste is stolen by jihadists in the middle of the night from an unguarded New York City hospital, the police, in a frantic race against time, call in the FBI. Luke Stone, head of an elite, secretive department within the FBI, is the only man they can turn to. Luke realizes right away that the terrorists' aim is to create a dirty bomb, that they seek a high-value target, and that they will hit it within 48 hours.

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.

When a joint FBI-Seattle Police investigation of an international child pornography ring gets too close to certain powerful people, sex-crimes detective Livia Lone becomes the target of a hit that barely goes awry - a hit that had been offered to John Rain, a retired specialist in “natural causes.” Suspecting the FBI itself was behind the attack, Livia reaches out to former Marine sniper Dox. Together, they assemble an ad hoc group to identify and neutralize the threat. There’s Rain. Rain’s estranged lover, Mossad agent and honeytrap specialist Delilah. 

John Dempsey's life - as an elite Tier One Navy SEAL named Jack Kemper - is over. A devastating terrorist action catapults him from a world of moral certainty and decisive orders into the shadowy realm of espionage, where ambiguity is the only rule. His new mission: hunt down those responsible for the greatest tragedy in the history of the US Special Ops and bring them to justice.

CIA analyst Jack Ryan, historian and former Marine, is vacationing in London with his wife and young daughter. Suddenly, right before his eyes, a terrorist group launches its deadly attack. Instinctively, Jack dives forward to intervene. By his impulsive act, he gains both the gratitude of a nation and the enmity of its most dangerous men who will not sit on their hate. In an explosive wave of violence, Jack's new enemies will seek to make him pay for his act of salvation...with his life.