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1969. Eloise Shepherd, one of MI6’s brightest rising stars, is working undercover in Soviet Russia as Magdalina Novikova. Her mission is to persuade nuclear physicist Stanislav Kalashnik to defect and bring his knowledge of Russian weapons back to the UK. On the verge of success, the operation fails suddenly and spectacularly.

Seventeen years later, Kalashnik is chief engineer at the power plant near Pripyat known as Chernobyl. His concerns for the safety of the plant are growing. When his views lead to accusations that question his patriotism, he finds himself in a very risky position.

Meanwhile, back in London, Eloise Shepherd’s life and career are spinning out of control when she’s approached with a one-time offer to redeem herself. The mission: to get Kalashnik over Soviet borders once more. It’s an opportunity that could change everything, and Eloise knows there’s no reward without risk. But she’s heading straight towards a danger far greater than she could ever have anticipated.

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Published May 2, 2022

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About the author

Mark Dawson

114 books1,855 followers
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Mark Dawson was born in Lowestoft and grew up in Manchester and Chicago. He has worked as a lawyer and currently works in the London film industry. His first books, "The Art of Falling Apart" and "Subpoena Colada" have been published in multiple languages.

He is currently writing two series. Soho Noir is set in the West End of London between 1940 and 1970. The first book in the series, "The Black Mile", deals with the (real life but little known) serial killer who operated in the area during the Blitz. "The Imposter" traces the journey of a criminal family (think The Sopranos in austerity London and you'd be on the right track).

The John Milton series features a disgruntled special agent who aims to help people to make amends for the terrible things that he has done. Mark, as a child of the 80s, will freely admit that he watched a lot of The Equalizer in his youth.

Mark lives in Wiltshire with his family.

You can find him at www.markjdawson.com or www.facebook.com/markdawsonauthor.

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5 stars
937 (49%)
4 stars
651 (34%)
3 stars
238 (12%)
2 stars
42 (2%)
1 star
21 (1%)
Displaying 1 - 30 of 89 reviews
Profile Image for Kathi Defranc.
1,182 reviews498 followers
January 14, 2022
The meltdown at Chernobyl, April 26, 1986...Was it Really an 'accident'...Or could there have been other factors, and people, at work. What an intriguing look into the disaster, with many characters involved in different plans, most behind another's back, deceit rampant among 'colleagues'. Could this have really been planned? A plan by enemies, perhaps another country, to cause an incident from which there would be no turning back...Would anyone really plan That, knowing the lives that could be lost, the effects to the land to go on for years, their own people unable to make it back. The radiation that would cause horrible changes to all we know, would anyone care...
This story drops you inside a Cold War mission that starts years before Chernobyl, and continues with some of the same people involved again years later. It will make you think, hold your breath as you read, and feel that twist of your gut as the explosion is shown before our eyes. This author takes you on a road you may find hard to travel, weaving you a story you believe, no matter what you have heard before...
I received an ARC from the author and I offer You my honest thoughts and feelings in this review.
Profile Image for Silver Thistle .
151 reviews33 followers
April 27, 2023
Listened to this on Audible. A bit boring but the last hour or so brought it up from a 2.5* to a 3.5* - generously rounded up. I've been obsessed with Pripyat and Chernobyl since the accident happened (showing my age here :/) and will read pretty much anything I find about either so I was all over this when I saw it, it's just a little bit of a let down. Decent storytelling I guess and the narrator on audible did a good job on UK, American and Ukrainian accents but nothing much happened until the last few chapters and all seemed a bit too easily wrapped up. Couldn't really tell the Ukrainian characters apart (even down to whether male/female) but the narrator made them sound like she knew her way around the language.

I'm not sure if this fits into an already existing series or is a standalone because I've been given conflicting advice from others who read Mark Dawson, so maybe I missed the point of it in relation to other stories but whatever, it is what it is. It's a nice cover though! NEXT!
Profile Image for Abibliofob.
1,595 reviews102 followers
March 29, 2022
The Group Fifteen Files is such a great addition to the other series by Mark Dawson and Wormwood is no exception. It is a story about Eloise Shepherd trying to get Stanislav Kalashnik out of Russia during a period of 17 years. It is also a new take on what happened in Chernobyl. It is a very interesting tale about how espionage and patriotism can work or not work. I have yet to read a bad book by this author he has some interesting characters and plotlines in this series we get small pieces of how and why Group 15 started and how it functions told from different point of views in each book. You can of course read all the series as separate but they do connect over time.
Profile Image for Kristine.
3,426 reviews52 followers
February 11, 2023
4.25 Stars 🌟

First of all, I pretty much love all of Mark Dawson's series. The John Milton series, The Beatrix Rose Series, the Isabella Rose series...and I guess this is a new spin off series set in the same world called the Group Fifteen Files. It isn't until the VERY end of this book that I was able to figure out how in the world that this book fit into any of the existing worlds of any of the previously mentioned series...but I DID figure it out.

This story is set in a couple of different timelines but the crux of the story centers on two particular characters. A British woman working for the Service in the 1960's whose job it was to convince a Russian nuclear submarine scientist to defect to the West and the actual Russian scientist. Without going into spoilers, things do not work out as planned and the book goes from there.

Then the time line moves forward many years and we are somehow thrown back to a situation dealing with these two characters again.

I enjoyed this book. The story was exciting and pulled from the headlines (granted, these headlines occurred n the 1980's, but they still occurred.

As always, I loved then narration done by Gemma Whelan because these books always feature at least one British citizen and I am a sucker for the accent.

The storyline was filled with drama, intrigue and lots of action as things grew to the climax. I'm interested to see where Mr. Dawson goes from here since as a long time reader, I know the ending already or at least how things wind up with Group 15.

It will be fun to see how it became the organization it eventually grew in to - for better or worse.
Profile Image for Debbie Mcnally.
980 reviews1 follower
January 14, 2022
I was lucky enough to have gotten a ARC copy of this book from the author. I am volunteering to leave this review. Awesome book plenty of twist and turns and some questions that I have always wondered about answered.
Profile Image for P..
Author 1 book11 followers
January 21, 2022
Very enjoyable

A good spy thriller with an interesting nuanced amoral perspective along with a wonderful twist at the end. I would certainly recommend this book
Profile Image for Anne G. Kasaba.
1,923 reviews9 followers
January 14, 2022
I'm torn about this book. I would have given it a 3.5 rating if I could. I generally like this author so I was excited to see a new book written by him. The writing was excellent and there was plenty of suspense and some action. However the storyline fell flat for me and the characters were for the most part pretty bland. The book was set primarily in Russia and other communist block countries and did give a fair representation of life there.

I received an arc of this book and voluntarily provided a review.
62 reviews1 follower
February 24, 2022
Riveting, Fascinating and Believable……

Having read a lot of Mark Dawson’s books……not a one has ever disappointed…Wormwood, Mark has taken too a whole other level. Weaving history into a believable and feasible devious plot to destabilise Russia. A very well crafted story, gripping and hard to put down……highly recommended, thank you Mark for excellent read👏🏻👏🏻👏🏻
Profile Image for Matthew.
37 reviews
March 4, 2022
quite possibly Dawson’s best book yet

Reading this at the same time Russia invaded Ukraine and captured the former Chernobyl power plant. Set the same time as nuclear accident that destroyed the plant. Making for a very gripping thriller and cat and mouse game with the KGB. Well worth reading.
Profile Image for Mike.
5 reviews9 followers
February 10, 2025
Mark Dawson's *Wormwood* is an electrifying masterpiece that plunges readers into a web of international espionage and political machinations. This riveting novel, which navigates the shadowy corridors of global intelligence, is a thrilling ride from start to finish.

The intricacies of Dawson's plot are nothing short of genius, weaving together a tapestry of deceit, betrayal, and strategic brilliance that keeps readers on the edge of their seats. The detailed portrayal of secret services across the world, from MI6 to the CIA and beyond, adds a layer of authenticity and depth that is both captivating and educational. Dawson's meticulous research shines through, offering a glimpse into the high-stakes world of espionage that is rarely seen with such clarity.

The characters in *Wormwood* are complex and multifaceted, each with their own hidden agendas and backstories that add to the novel's rich tapestry. The protagonist is a masterful creation, a blend of cunning, resilience, and vulnerability that makes for a compelling and relatable hero. The antagonists, equally well-crafted, bring a level of menace and unpredictability that heightens the suspense with every turn of the page.

Dawson’s writing is crisp, engaging, and filled with vivid descriptions that transport readers into the heart of the action. The pacing is impeccable, with twists and turns that are expertly timed to maintain a pulse-pounding tempo throughout. The political intrigue is masterfully handled, presenting a gripping narrative that is as thought-provoking as it is thrilling. Each chapter peels back another layer of the convoluted plot, revealing secrets and surprises that keep readers hooked until the very last page.

*Wormwood* is a tour de force in the espionage thriller genre. It’s a must-read for anyone who enjoys a well-crafted tale of international intrigue, filled with twists, turns, and a deep dive into the shadowy world of global intelligence. Mark Dawson has truly outdone himself with this one, delivering a story that is both mesmerizing and unforgettable.
Author 3 books5 followers
October 11, 2022
We are taken back to the late 60s and MI6 operative Eloise Shepherd is in the far East of the USSR, nurturing her contact – nuclear physicist Stanislav Kalashnik – and hoping to persuade him to defect. The operation takes an unexpected turn and the next time we meet Shepherd it is almost two decades later and her career has never recovered from the setback.
After a particularly bad day, she is offered a way to resurrect her career. Kalashnik is now Chief Engineer at Chernobyl, and he has concerns about the safety of the Soviet nuclear program, and the reactors at Chernobyl in particular. However, his bosses refuse to acknowledge the problem, and he is soon questioned by the KGB. The mysterious Victor Bloom wants Shepherd to use her relationship with Kalashnik to persuade him to come to the west and tell all.
I rather liked this. Although it can be a little slow, I found it a good read, and although flawed it is hard not to have some sympathy for Eloise. However, I found the main premise of the book to be almost a side-line – the protagonist and activities of this man are barely mentioned, with just a brief hint here and there and a chapter or two near the end. The Bloom character is clearly the man behind Group Fifteen – in the closing pages he laments the lack of a team who could perform the ‘wet-work’ carried out by a mysterious CIA agent.
Profile Image for Tobias.
319 reviews1 follower
September 8, 2022
Mostly well written, this is a slightly (very) implausible alternative history of the Chernobyl disaster. The characters are credible, and the descriptions bring to life the realities of life in Soviet Russia during the 80s. Some elements of the spy genre stand up to scrutiny, whilst some don't, but it is generally an enjoyable enough romp.

A note on the audio version - the narration was good and clear, but, frustratingly, the narrator didn't take the time to research, or the studio didn't bother to provide, some correct pronunciations for the Russian and Ukrainian. As an example, the narrator reads out the letter M, I and G, rather than pronouncing them together as Mig. Little details like this grated on what was otherwise a good and slick production. 3.5 stars, rounded up to 4.

Profile Image for Harper.
10 reviews11 followers
January 17, 2022
Mark Dawson is one of my favorite authors! If you enjoy this genre his writing is on par with Lee Child, Vince Flynn, Michael Connelly, Nelson DeMille, just to name a few. This particular book is about events during the Cold War.
In order to understand the concept of Group 15, it would be helpful to read some of his earlier works. Namely, at least one book from the John Milton series. Otherwise, you can ignore the reference to Group 15. It’s there for those who have read the rest of his books but it has no bearing on the plot. The book takes place in time before the John Milton series and is a complete standalone book.
135 reviews
January 26, 2022
Intriguing

This book draws you in from the very first page and is a must read for any fan of Mark’s writing or a lover of tense thrillers, that have it all, suspense, murder, espionage and intrigue.
You can tell by the amount of detail that there is in story with regards to the workings of a nuclear power plant and life in the Soviet Union, that Mark really does put a lot of research into his work, add that to his brilliant imagination and writing skills and you end up a fascinating story just like Wormwood.
Happy reading. 😀
204 reviews3 followers
February 15, 2022
I don't know how Mark Dawson does it. He is a MASTER storyteller. This book keeps you turning the pages so fast, just to see what is going to happen next.

I would have to say that if you want a good read, this is it. Mind you, any Mark Dawson book is a good read. We have every book he has written and even though this is his latest book, (FEB 22.)
I cannot pick which one of his books I could genuinely say , THIS IS THE BEST BOOK MARK HAS WRITTEN. Because they are all that bloody good.
211 reviews
March 30, 2022
Wormwood is a full novel. Beginning with a character whose agent career is about over to that same agent we’ll on the way to a sequel. Characters are all drawn fully, the plot extensive, and researched fully. I have read Dawson, and this novel seems to be totally different, but just as well done as the others. Dawson’s research into nuclear power, radiation sickness stands us all in good favor because his good work builds the tension that keeps us running with his characters until the very end.
Profile Image for John A. Sillasen.
360 reviews4 followers
June 11, 2023
A Bungled MI6 Op that leads to a tale of what may have happened at Chernobyl

One tale as only Mark Dawson could tell it that is a story of espionage, Russian defectors, families destroyed, murders, lies and ultimately the question that's on Vivian Bloom's mind, just how would I go about making a group of men and women 'cleaners' that could mop up after an operation went sideways?
Yes, that disheveled, powerful Vivian Bloom. The man Control reports to in Group Fifteen. This story still predates the Group!
61 reviews2 followers
January 17, 2022
Sorry I found this a bit dull

I'm a big fan of Mark Dawson novels just completed John Milton stories for the second time,but I was disappointed in this book. The characters did not pull me in it was difficult to care about them. The storyline was all about Chernobyl and know that story from our perspective but we learned little more from this tale.
I wanted to love it, I even paid for it but don't recommend to real John Milton and Group 15 fans as this was just dull.
1,477 reviews25 followers
January 20, 2022
Wormwood. Mark Dawson

A masterfully written tale of espionage, deceit and betrayal. The nuclear explosion that occurred at Chernobyl wasn't an accident. It was masterfully planned by people in powerful positions. A lot of organizations like Greenpeace are actively opposed to nuclear plants. The oil industries profits will soar dramatically. This is an excellent tale of fiction but it makes you wonder. Was Chernobyl really an accident?
43 reviews
January 31, 2022
I'm a fan of Mark Dawson but have to say this was not a book I could recommend.The characters were thin,the storyline was shallow and the first half of the book completely forgettable.Had this not have been a Mark Dawson story then I would have given up way before the end because there was very little to keep me interested.With only fleeting references to Group 15,I'm really not sure why this book was suggested as being part of that series.Sorry Mark but not your best by quite some way.
3 reviews
November 15, 2022
Decent plot, but the story didn’t require sabotage, the truth would have been suffice to for a storyline

No novel should distort the truth about what happened at Chernobyl, without a disclaimer that sabotage is pure fiction. The insane test that the communists performed that caused supercriticality is missing from the plot. And the American nuclear industry have a containment, not because reactors can blow up (they cant) but because they can have fuel melt.
Profile Image for K R.
30 reviews1 follower
January 17, 2022
Captivating perspective on the Chernobyl disaster

I found this story difficult to put down. Its not my usual genre but love learning things about history, even if tempered with fictional writing. If youre looking for a happy ending, you wont find it. This is why ive given it 4 stars, i do love it when things work out.
Profile Image for Dave.
638 reviews9 followers
January 18, 2022
This was a very good prequel to the many Group 15 stories. The plot was clever and inventive - what if the Chernobyl disaster was caused by a malicious plan from foreign intelligence agencies? In addition, we get to see the organizational obstacles that later lead to the creation of the black ops Group 15. As always, well written and entertaining.
25 reviews4 followers
January 25, 2022
Outstanding. Scary but outstanding!

Dawson’s work is uniformly excellent, readable and its many plot threads are endlessly fascinating. This book goes back beyond the beginning and also moves the author firmly into a new dimension of intrigue at the highest of geopolitical levels. Great stuff.
432 reviews8 followers
January 27, 2022
CC1

Mark this was an excellent book. The whole plot with Bloom and the under cover agent in disgrace from 20 years ago was perfect setup to revisit the situation again. The poor Russian was played all the way around. All he wanted to do was make everyone aware of Russia lack of nuclear safety. In end he was used also. Great story 10 stars plus!!!! Thanks, Carl Clause. by
203 reviews
January 29, 2022
Disappointed. I usually enjoy Mark Dawson books but this is the first one I felt ambivalent to. It wasn't a bad story, and the characters weren't bad if a little shallow. I think that was the problem, nothing was bad but it certainly wasn't up to his usual standard. The ending appears to indicate follow on stories. Maybe I'll see how the follow on book reads and take it from there.
351 reviews1 follower
February 4, 2022
great book

Mark Dawson never fails when he writes a thriller. He’s as good as anyone in the business. This book provides lots of intrigue, great characters, plenty of action along with sadness and joy at the outcomes. Plus a healthy does of “what if” left planted in our minds. I highly recommend anything Mark writes. Never disappoints!
Profile Image for Bill  Thompson.
27 reviews1 follower
March 9, 2022
too technical but good

Good book in the end but it was too technical and felt like Dawson was trying to teach me about nuclear physics and too many Russian names to remember and streets as well. When the story progresses and got away from how a nuclear reactor works it was a classic Mark Dawson book.
Displaying 1 - 30 of 89 reviews

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