“Sharp, cinematic, and packed with action–the Gray Man novels blow all other thrillers away!”

brad thor, #1 new york times bestselling autor of black ice

“So many bad guys, so little time…”

“Over-the-top thrills. Greaney never disappoints.”

kirkus reviews

“Greaney hit absolute literary gold with his Gray Man series…and Sierra Six is no exception!”

mystery & suspense magazine

“Excellent….”

“Greaney seamlessly adjusts focus between the timelines, jumping from one exhilarating roller-coaster ride to the other. Spy and military thriller fans will be well pleased.”

publishers weekly

“Bestseller Greaney’s excellent 11th Gray Man novel (after 2021’s Relentless) delivers a double helping of honorable mercenary Courtland Gentry (aka the Gray Man), smoothly alternating between his first assignment with the “door kickers” of CIA paramilitary team Golf Sierra to interdict a terrorist group intent on detonating dirty radioactive bombs against American forces and his present-day quest for revenge on the planners of that enemy action. In the past, Gentry, though already a whispered figure in the halls at Langley, struggles to integrate his “singleton” lone-wolf strategies (and sometimes naive moral code) with unfamiliar military tactics, but team leader Zack Hightower is impressed with his almost-preternatural killing and tradecraft abilities, and Gentry is deployed with the squad to Pakistan. Twelve years after the devastating end of that mission, Gentry stumbles into his presumed-dead adversary, Murad Khan, on the cusp of staging an even deadlier evolution of his earlier plan. Greaney seamlessly adjusts focus between the timelines, jumping from one exhilarating roller-coaster ride to the other. Spy and military thriller fans will be well pleased.”

publishers weekly

Sierra Six
CHAPTER ONE

Twelve Years Ago

Zack Hightower and the five other men of Golf Sierra watched the scene before them as if they were merely spectators, when in fact they were the stars of the show, waiting in the wings for the play to begin.

Fifty yards away from them, the ramp lowered slowly on the Lockheed C-130 Hercules. A scarlet glow shot like a soft ray from inside the cabin, illuminating the tarmac, and the plane’s four massive turboprops spun at idle, growling in the cool night.

Ground crew worked feverishly around the aircraft, moving this way and that as they readied it for its upcoming flight.

The light from the cabin did not quite reach Hightower and his men on the tarmac; they remained in the dark, gazing on, interested but unconcerned.

The six men were armed and armored, festooned with heavy equipment and bulky parachutes, but they endured patiently, embracing the suck of the weight on their bodies. The sixty pounds of gear strapped to each man made unnecessary movement ill-advised, so all of them knew better than to waste energy now, before their arduous evening had even begun in earnest.

The ground crew in front of them did not engage with or even look at the operators in the dark. That was considered bad form, so the six men were left alone with their thoughts, gazing at the glowing rear of the hulking aircraft in front of them and waiting for their cue.

All six operators wore quad-tube night vision goggles stowed in the up position on their helmets. They were also equipped with rifles, pistols, and extra ammunition, as well as fragmentation, flash bang, and thermite grenades.