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  • Sierra Six

  • Gray Man, Book 11
  • Written by: Mark Greaney
  • Narrated by: Jay Snyder
  • Length: 15 hrs and 58 mins
  • 4.8 out of 5 stars (267 ratings)

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Sierra Six cover art

Sierra Six

Written by: Mark Greaney
Narrated by: Jay Snyder
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Publisher's Summary

It's been years since the Gray Man's first mission, but the trouble's just getting started in the latest entry in the number one New York Times best-selling 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.

©2022 Mark Greaney Books LLC (P)2022 Audible, Inc.

What listeners say about Sierra Six

Average Customer Ratings
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  • Overall
    5 out of 5 stars
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    5 out of 5 stars

A terrific read

A terrific read that ties the story of 12 years ago to the present that I thoroughly enjoyed. It kept me going on my long walk this morning.

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  • Overall
    5 out of 5 stars
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    5 out of 5 stars

Can’t wait till but we comes out

I’ve listened to all of the grey man novels. They just get better and better leaving you wanting more. Now I’m stuck waiting for the next one

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  • Overall
    5 out of 5 stars
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    4 out of 5 stars
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    4 out of 5 stars

Sierra Six a powerful engaging ride

I was originally concerned with the length of the book but the story, I should say stories running parallel over 12 years are equally engaging and solid in themselves. But the way they blend to an incredible ending is wonderful and satisfying. I will seek out more of this authors Work!

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  • Overall
    5 out of 5 stars
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    5 out of 5 stars

Great Book

Great story! I was anxiously awaiting the new Grey Man book and I wasn’t disappointed.

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  • Overall
    5 out of 5 stars
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One of the best…

…by two of the best! Mark Greaney and Jay Snyder do it again!

Two terrific intertwining stories and one great, big love letter to fans of the series.

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  • Overall
    5 out of 5 stars
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    5 out of 5 stars

2 Thrillers in one

I love the Gray man series. This book is basically 2 books in one shuttling back and forth between 2 periods 12 years apart.
The pace is great, the characters believable and I was thoroughly entertained.
The narrator is excellent!

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  • R M
  • 2023-07-09

Maybe the best book yet!

Huge fan of the whole series but getting the origin story was awesome. One of the top two or three in the series if not the best. Well done!

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    5 out of 5 stars
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Gives some great history on the gray man.

Love the back and forth of past and present. One of the better books in the series.

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Can’t get enough of the Sierra Six

I’ve listened to all of Mark Greaney’s books, and the Grey man series is just amazing. The sardonic humour hiding the underlying personal struggles of the main character trying to make a difference, is both refreshing and endearing. I like all the supporting characters too, except for Suzanne Brewer - she’s a bit over the top as an antagonist, not that believable. Good work and can’t wait for the next one in the series!

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    5 out of 5 stars
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best one yet

I thought I'd be impatient with the flashbacks but they really helped bring the present a sense of context in a very intriguing way. It was great to see how Court developed, too, giving more of a vulnerable edge to him than expected. I loved it!!

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