A breakneck race against time…and an implacable enemy. An anonymous young woman murdered in a run-down hotel, all identifying characteristics dissolved by acid. A father publicly beheaded in the blistering heat of a Saudi Arabian public square. A notorious Syrian biotech expert found eyeless in a Damascus junkyard. Smoldering human remains on a remote mountainside in Afghanistan. A flawless plot to commit an appalling crime against humanity. One path links them all, and only one man can make the journey. Pilgrim.

Evan Smoak is a man with skills, resources, and a personal mission to help those with nowhere else to turn. He’s also a man with a dangerous past. Chosen as a child, he was raised and trained as an Orphan, an off-the-books black box program designed to create the perfect deniable intelligence asset: An assassin. Evan was Orphan X - until he broke with the program and used everything he learned to disappear. But now someone is on his tail.

Cal Hooper thought a fixer-upper in a bucolic Irish village would be the perfect escape. After 25 years in the Chicago police force and a bruising divorce, he just wants to build a new life in a pretty spot with a good pub where nothing much happens. But when a local kid whose brother has gone missing arm-twists him into investigating, Cal uncovers layers of darkness beneath his picturesque retreat, and starts to realize that even small towns shelter dangerous secrets.

Joey Morales was the last recruit of the government's full black operation, the Orphan Program. Trained to be an assassin until she washed out, she was rescued by Evan Smoak, the former agent known as Orphan X. Now Joey, a world-class hacker, starts training for one of her biggest challenges yet: having a normal life. Still a teenager, she discovers she loves music as much as hacking, if not more so. But as she carves out a space for herself, the one thing missing is a family to support her endeavors.

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.