Sierra Six

By Mark Greaney

Sierra Six - Mark Greaney
  • Release Date: 2022-02-15
  • Genre: Mysteries & Thrillers
Score: 4.5
From 2,021 Ratings


It's been years since the Gray Man's first mission, but the trouble's just getting started in the latest entry in the #1 New York Times bestselling series.

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, at a terrible price. Years have passed. 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 of time hasn't changed the Gray Man. He isn't one to leave a job unfinished or a blood debt unpaid.


  • Sierra Six

    By Edmdwp
    Mark Greaney has been waiting to write this book for a long time. Best book i’ve read all summer. Thanks
  • Greyman

    By jprice6
    Very good book,like the other books with the greyman
  • Thrilling Story

    By Tobywannkenobi
    This book is one of Greaney’s best works in The Grey Man series! Action packed and two stories in one with part of the novel relating events from 12 years ago with present day action. Really a fantastic book!
  • Double Trouble, Double the Action

    By Scottzo3
    Great, great read as usual! Mark Greaney has Court Gentry going back to the beginning to show us how he became Six. In parallel we get the pleasure of a “Present Time” that Court is working through. Action throughout for all!
  • Read the whole series and loved everyone of them!

    By HAH02
    This is a great series filled With exciting twists and turns! My only regret is that I have to wait to next year to find out what Violator is up too!
  • Sierra Six

    By Kckdkdko
    Best Gray Man book yet.
  • Gray Man

    By JDW8848
    Another great read in this series. Highly recommend.
  • Sierra six

    By Sin Loi
    I paid $14.00 to read 52 pages? This stinks.
  • Sierra Six

    By JPB 9871
    We’ll done. An exciting thriller.
  • Fantastic

    By Maximous13#1
    Greaney gets better and better. I think this was his best yet.