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Mark Dawson
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Witness X: A Group Fifteen Novella (Group Fifteen Files) Kindle Edition

by Mark Dawson (Author), Scott Mariani (Author) Format: Kindle Edition
4.5 4.5 out of 5 stars 1,864 ratings
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Mark Dawson’s Group Fifteen Files. Quick, lightning-paced, action from the first page to the last.

Bryan Duffy is Witness X - a government agent implicated in a national scandal and banished to Spain until the agenda can be moved on.

But when North Korean hitmen attack a seeming innocent on the streets of London, Duffy is called back to the fold. He is tasked with finding the woman's assailants and bringing them to justice.

Why has the woman been attacked? Duffy investigates, and finds himself sucked into a whirlwind of action and mayhem that is particularly well suited to his special set of skills...


Praise for Mark Dawson:

"It’s impossible not to think of Lee Child’s super-selling Jack Reacher. " - The Times

"A literary sensation." - The Daily Telegraph

"Dawson writes the kind of thrillers I love. Non-stop, grab-you-by-the-throat tales of doing the right thing no matter the odds. Simply excellent." - USA Today bestselling author Brett Battles.

More than 1m copies sold in the John Milton and Rose series and 1000s of five star reviews.
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  1. Part of series
    Group Fifteen Files
  2. Print length
    92 pages
  3. Language
    English
  4. Publication date
    December 13, 2017
  5. File size
    1.3 MB
  6. Page Flip
    Enabled
  7. Word Wise
    Enabled
  8. Enhanced typesetting
    Enabled
  9. See all details
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There are 5 books in this series.
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Bundle price: Kindle price
$12.97
Bundle price: Kindle price
$18.95
By placing your order, you're purchasing a license to the content and you agree to the Kindle Store Terms of Use.

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Editorial Reviews

About the Author

Mark Dawson’s books have sold more than a million copies and have been published in multiple languages. The John Milton series features a disgruntled assassin who aims to help people make amends for the things that he has done. The Beatrix Rose series features the headlong fight for justice of a wronged mother – who happens to be an assassin – against the six names on her Kill List, while the Isabella Rose series tells the story of Beatrix’s daughter. Soho Noir is set in the West End of London between 1940 and 1970. Mark lives in Wiltshire with his family.

Product details

  • ASIN ‏ : ‎ B0788SRC2P
  • Publisher ‏ : ‎ Unputdownable (December 13, 2017)
  • Publication date ‏ : ‎ December 13, 2017
  • Language ‏ : ‎ English
  • File size ‏ : ‎ 1.3 MB
  • Simultaneous device usage ‏ : ‎ Unlimited
  • Text-to-Speech ‏ : ‎ Enabled
  • Screen Reader ‏ : ‎ Supported
  • Enhanced typesetting ‏ : ‎ Enabled
  • X-Ray ‏ : ‎ Not Enabled
  • Word Wise ‏ : ‎ Enabled
  • Print length ‏ : ‎ 92 pages
  • Customer Reviews:
    4.5 4.5 out of 5 stars 1,864 ratings

About the author

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Mark Dawson

Mark Dawson

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Mark Dawson has worked as a lawyer and in the London film industry. He has sold over six million copies of his propulsive, exciting thrillers and is best known for his John Milton, Beatrix and Isabella Rose and Atticus Priest series.

Customer reviews

4.5 out of 5 stars
1,864 global ratings

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Customers say

Customers enjoyed the book and found it an enjoyable read. They appreciated the fast-paced storyline and action-packed plot. Readers praised the writing quality as superb and enjoyed the author's work. The characters were described as well-developed and realistic. However, some felt the story was too short.

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ReadabilityStorylineWriting qualityCharacter developmentInformation qualityLength
42 customers mention "Readability"42 positive0 negative

Customers enjoy this book. It's a quick, easy read that keeps them engaged. They find it satisfying and worth the time.

"...The writing still works and is a very enjoyable and exciting read. There are twists and turns that will captivate the reader...." Read more

"...'s infamous Group 15 roster, readers are treated to, not only a fast-paced, smart and no-nonsense mission, but also a look under the hood of Group..." Read more

"...For a short story (novella) there's non-stop action and tenderness which are hallmarks of Mr. Dawson's books. Great reading for a very late bus." Read more

"What a faced paced read. It keeps you moving right along. This could be the start of something new with Bryan Duffy...." Read more

42 customers mention "Storyline"42 positive0 negative

Customers enjoy the storyline. They find it action-packed and interesting. The backstory about another character is a nice addition. However, some feel the book is too short.

"...The writing still works and is a very enjoyable and exciting read. There are twists and turns that will captivate the reader...." Read more

"...The action was excellent, as usual." Read more

"...X is a seamless collaboration with Scott Mariani, and a great stand-alone story that delivers all the great elements of a Group 15 mission we've..." Read more

"...The action was plausible with a current theme of today. I've never been disappointed by a book by Mark Dawson...." Read more

14 customers mention "Writing quality"14 positive0 negative

Customers appreciate the writing quality of the book. They find the writing enjoyable, fast-paced, and punchy. Readers praise the author's writing style as superb and look forward to more from him.

"...The writing still works and is a very enjoyable and exciting read. There are twists and turns that will captivate the reader...." Read more

"A fabulously exciting storyline! The author is so talented...." Read more

"This gap-filler story is everything faithful readers have come to expect from a book with Mark Dawson's name on the cover!..." Read more

"...Mark's writing is suburb in this short story. Very engaging. So excited to see this author succeed in his endeavours." Read more

9 customers mention "Character development"9 positive0 negative

Customers enjoy the character development. They say the characters come to life and the scenes of the story make them feel as if they are there.

"Even though this is a novella, the characters were well defined. The action was plausible with a current theme of today...." Read more

"...a quick, but very good story involving the Group 15 world, with a new character - one I would dearly love to see more of in the future!..." Read more

"...The author is so talented. The characters come to life and the scenes of the story make you feel as if you were there...." Read more

"...Keep up the great work and interesting characters." Read more

3 customers mention "Information quality"3 positive0 negative

Customers enjoy the novellas. They appreciate learning more about the characters in the Milton story, especially Bryan Duffy. The stories keep readers on the edge with suspense.

"...in the past is clear, and the author has done a great job revealing further info on Bryan Duffy. I really liked learning more of his story" Read more

"...I enjoy these Novellas. Short insights on the individuals within Group 15." Read more

"Great story, love meeting other members of the Group. Keeps you on the edge. Mark Dawson is such a great story teller. Cannot wait for the next one." Read more

3 customers mention "Length"0 positive3 negative

Customers feel the book is too short.

"...The story is good, but so disappointed in its length." Read more

"...driven from the first chapter but the story was so fast paced it seemed too short. I'm looking forward to Group Fifteen Files Book 3." Read more

"Too short..." Read more

Top reviews from the United States

  • charlotte miller
    5.0 out of 5 stars NEW ADVENTURES FOR A NEW HERO
    Reviewed in the United States on December 14, 2017
    Verified Purchase
    This book has plenty of action like the fans of Mark Dawson's writing have come to expect. The book is written with another author so there is a small difference in style. The writing still works and is a very enjoyable and exciting read. There are twists and turns that will captivate the reader. I am looking forward to the next book in this series. I really do not like to tell readers what the book is about so as not to spoil the fun. I highly recommend this book for actions fans.
    One person found this helpful
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  • Christopher H. Torti
    4.0 out of 5 stars Witness X an Excellent and Quick Read
    Reviewed in the United States on January 12, 2018
    Verified Purchase
    I don't think I am in the minority when I say that I do not like to see my favorite authors employing "junior authors" (for the lack of the correct term) to co-write stories with them. This is the first time I noticed Mark Dawson doing it. Witness X is a novella about a Group Fifteen operative (#12) given an assignment of tracking down some North Korean assassins. Bryan Duffy is the operative and the reader will find him interesting to be sure. Perhaps a little too undisciplined and resistant to and disrespectful of authority to be believable in a British intelligence agency. The action was excellent, as usual.
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  • jchung7855
    5.0 out of 5 stars Like a good shot of caffeine...
    Reviewed in the United States on December 16, 2017
    Verified Purchase
    Short but sweet and spicy, Witness X takes the reader on a fast and furious ride. Written as a slice of history in Mark Dawson's infamous Group 15 roster, readers are treated to, not only a fast-paced, smart and no-nonsense mission, but also a look under the hood of Group 15 agent Bryan Duffy. Whether you're already familiar with Mark Dawson's world of Group 15 or just meeting them for the first time, Witness X is a seamless collaboration with Scott Mariani, and a great stand-alone story that delivers all the great elements of a Group 15 mission we've come to look forward to.
    One person found this helpful
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  • Pat Ziggy
    5.0 out of 5 stars Great action -- Great characters
    Reviewed in the United States on December 16, 2017
    Verified Purchase
    Even though this is a novella, the characters were well defined. The action was plausible with a current theme of today. I've never been disappointed by a book by Mark Dawson. The main character in Witness X is Duffy. He is a brutal man but hasn't lost all of his compassion. He may think all he does is kill, but there is the love of his country above all else. I hope there might be an expanded version of Duffy in the future. He needs to finish the job he started in this novella of stopping the Korean regime. Maybe it will be Duffy who will halt the threat of nuclear war. I would definitely recommend reading Witness X.
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  • Terry
    4.0 out of 5 stars Fast & Quick
    Reviewed in the United States on January 18, 2022
    Verified Purchase
    Doesn't mean dull and boring.
    There's a traitor leaking secrets to North Korea which could change the world dynamics.
    Can Duffy, still facing legal issues, stop the leak in time?
    For a short story (novella) there's non-stop action and tenderness which are hallmarks of Mr. Dawson's books.
    Great reading for a very late bus.
    One person found this helpful
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  • Amazon Customer
    5.0 out of 5 stars Duffy is the man!!
    Reviewed in the United States on February 15, 2022
    Verified Purchase
    Another amazing side story and introduction to Bryan Duffy. This guy has guts of steel as he faces evil from North Korea. These bad guts are a breed of pure evil and want some big secrets and their ruthless behavior sends Duffy after them!
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  • markrine
    3.0 out of 5 stars It's only a novella
    Reviewed in the United States on December 17, 2017
    Verified Purchase
    I am a fan of Mark Dawson, particularly John Milton, so I was excited to get this book. Then I was disappointed that it was only a novella and only took about an hour to read. The story is good, but so disappointed in its length.
    2 people found this helpful
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  • Kindle Customer Guzzialfa
    5.0 out of 5 stars A Novella that Leads to the Makings of all that Follows in Dawson's other Series
    Reviewed in the United States on June 5, 2023
    Verified Purchase
    This novella sees Group 15 lose their Oh never mind that would be spoiling it! Suffice it to say that this is an intermediary filler that had it been around awhile ago, would have filled in so many gaps with Beatrix Rose & John Milton let alone Pope. Yet none of them but Rose are mentioned here.
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Top reviews from other countries

  • S. D. KNIGHT
    5.0 out of 5 stars Short but sweet.
    Reviewed in the United Kingdom on January 14, 2025
    Verified Purchase
    A nice little novella and a bit racy. A fast paced novel that gives the origins of the black assassins group. Another member included in the face to stop North Korean arms pilfering.
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  • Neelabh Pratap Singh
    4.0 out of 5 stars Quick read
    Reviewed in India on February 4, 2024
    Verified Purchase
    "Witness X" is a novella centered on Bryan Duffy, a Group Fifteen operative tasked with unraveling the mystery behind North Korean assassins responsible for an acid attack on his former girlfriend. Duffy's intriguing character. The novella, marked by excellent action sequences, maintains a brisk pace, complemented by the brevity of the book. While Duffy's character may stretch credibility, "Witness X" offers an enjoyable and concise read for those seeking a dose of gripping espionage.
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  • Mike
    5.0 out of 5 stars Amazing
    Reviewed in Canada on May 3, 2019
    Verified Purchase
    I never thought I’d feel positive towards a character like Duffy, but Mark Dawson has managed it here. Despite knowing what awaits Duffy in his future, here we see a fiercely loyal man who has his own sense of right and wrong. I can’t wait for the next instalment... I’d even read a Duffy series if Mark ever decided to pursue it. Group Fifteen has a lot of potential and this story certainly stands up with Mark’s best work.
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  • Penny
    5.0 out of 5 stars Good Read
    Reviewed in Australia on November 7, 2022
    Verified Purchase
    This was a fast paced thriller and a good introduction to Group Fifteen. As with all Mark Dawson books a thoroughly enjoyable read.
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  • theditch
    5.0 out of 5 stars A great read (as usual)
    Reviewed in Canada on December 20, 2017
    Verified Purchase
    Fast paced. Entertaining. A definite page turner. Looking forward to the next instalment. Michael Dawson never disappoints. I strongly recommend him.
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