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Cold Sunset: The new mystery novel in the bestselling espionage series, from the author of Gabriel's Moon

Not yet published
Expected 3 Sep 26
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Cold War Moscow is a place smouldering with secrets. Gabriel Dax has been tasked with delivering a mysterious Blanco drawing to celebrated defector Kit Caldwell. But Caldwell is convinced the KGB suspects him of treachery, and he wants out now.



When Gabriel is ordered by his enigmatic handler Faith Green to help, he is pulled into a web of shifting loyalties and dangerous escape plans. As tensions rise and trust fractures, he is forced to confront the fine line between devotion and deception…

Cold Sunset, the third novel starring accidental spy Gabriel Dax, takes you deep into a shadow-drenched world where loyalty blurs, motives darken and every step could be fatal, in a tautly woven mystery from acclaimed bestseller William Boyd.

Kindle Edition

Expected publication September 3, 2026

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About the author

William Boyd

71 books2,650 followers
Note: William^^Boyd

Of Scottish descent, Boyd was born in Accra, Ghana on 7th March, 1952 and spent much of his early life there and in Nigeria where his mother was a teacher and his father, a doctor. Boyd was in Nigeria during the Biafran War, the brutal secessionist conflict which ran from 1967 to 1970 and it had a profound effect on him.

At the age of nine years he attended Gordonstoun school, in Moray, Scotland and then Nice University (Diploma of French Studies) and Glasgow University (MA Hons in English and Philosophy), where he edited the Glasgow University Guardian. He then moved to Jesus College, Oxford in 1975 and completed a PhD thesis on Shelley. For a brief period he worked at the New Statesman magazine as a TV critic, then he returned to Oxford as an English lecturer teaching the contemporary novel at St Hilda's College (1980-83). It was while he was here that his first novel, A Good Man in Africa (1981), was published.

Boyd spent eight years in academia, during which time his first film, Good and Bad at Games, was made. When he was offered a college lecturership, which would mean spending more time teaching, he was forced to choose between teaching and writing.

Boyd was selected in 1983 as one of the 20 'Best of Young British Novelists' in a promotion run by Granta magazine and the Book Marketing Council. He also became a Fellow of the Royal Society of Literature in the same year, and is also an Officier de l'Ordre des Arts et des Lettres. He has been presented with honorary doctorates in literature from the universities of St. Andrews, Stirling and Glasgow. He was appointed Commander of the Order of the British Empire in 2005.

Boyd has been with his wife Susan since they met as students at Glasgow University and all his books are dedicated to her. His wife is editor-at-large of Harper's Bazaar magazine, and they currently spend about thirty to forty days a year in the US. He and his wife have a house in Chelsea, West London but spend most of the year at their chateau in Bergerac in south west France, where Boyd produces award-winning wines.

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Displaying 1 - 17 of 17 reviews
Profile Image for Martin Baggs.
163 reviews4 followers
Review of advance copy received from NetGalley
June 19, 2026
William Boyd has done it again. With Cold Sunset, the third installment in his Gabriel Dax series, he delivers a spy novel that feels less like genre fiction and more like literature.

It is 1964, and Cold War Moscow is doing what Cold War Moscow does best: simmering with paranoia, secrets, and the constant threat of exposure. Gabriel Dax, that most reluctant of spies — a travel writer who somehow keeps finding himself in the killing business — is tasked with delivering a mysterious Blanco drawing to Kit Caldwell, a celebrated triple-agent living large as a Hero of the Soviet Union. Caldwell, convinced the KGB is closing in, wants Gabriel to do the unthinkable: smuggle him across the Russian border to Finland. With his enigmatic handler Faith Green pushing him forward, Gabriel is once again pulled into a world where loyalty is a moving target and trust is a luxury no one can afford.

Readers who came to Boyd through le Carré will feel right at home here. Cold Sunset inhabits the same shadow-drenched moral universe as The Spy Who Came in from the Cold and Tinker, Tailor, Soldier, Spy — all Cold War fog and psychological tension, with precious little in the way of gadgets or car chases. This is character-driven espionage at its most literary, and Boyd's storytelling genius is on full display. The prose is elegant, the atmosphere immersive, and the ethical murk that surrounds Gabriel genuinely uncomfortable in the best possible way.

As for Gabriel himself — three books in, he is now a three-time killer, which sits uneasily on a man who never asked for any of this. He is no James Bond. He does not sip martinis shaken not stirred; he drinks whatever he can lay hands on, and plenty of it. He shares his bed with three women in the course of this story, yet there is nothing glamorous about it. Boyd resists the seductions of the spy fantasy at every turn, keeping Gabriel grounded, flawed, and utterly human. That is precisely what makes him such compelling company.

My only caveat — and it is less a complaint than an observation — is that the ending is deliberately ambiguous, the kind of conclusion that leaves threads dangling rather than tying them off. It is both satisfying and maddening at once, clearly designed to presage, if not outright demand, a fourth and possibly final book to close things out properly. Consider yourself warned, and consider yourself hooked.

A big thank you to the publisher and NetGalley. I received a complimentary copy of this book. Opinions expressed in this review are completely my own.

#ColdSunset #NetGalley
Profile Image for Denis Wheller.
Author 1 book4 followers
Review of advance copy received from NetGalley
June 23, 2026
Kim Philby, the third “Cambridge Spy” defected in 1963. A year later, Gabriel Dax is in LA meeting a contact who might identify the “Fourth Man”. Gabriel is a professional Travel writer and an occasional, reluctant, MI6 asset, i.e. he’s not an actual agent of MI6, but can do a bit of spying while travelling the world. Back in the UK, he is MI6’s link to Moscow based, deep penetration agent, Kit Caldwell, although the KGB believe that Kit is their spy and Gabriel is his source. At times he wonders how he got into this mess, while acknowledging that being in love with Faith Green the head of a covert MI6 unit may be the reason. It now looks like Kit’s role as a double agent is compromised, because there is a new spy on the block. Kit need to get out of the USSR before he is exposed and then killed. Gabriel, on the pretext of writing a chapter about Moscow, is sent to help him exfiltrate.
This is the third book in what was flagged as a Trilogy. It works perfectly well on its own, although understanding Gabriel will benefit from reading the earlier books. It is well-written and plotted, although I did feel that the plot mechanics were a bit obvious. As usual, it is immersed in the real world of the time, its culture and its politics – Philby’s defection rocked the SIS. This is the world of the later Bond Books and the early Smiley Books, and it feel at home with these, though it is more Smiley than Bond. The last fifty pages or so seem to be setting up a different dynamic and presage a sequel, so perhaps it isn’t just a Trilogy after all.
I would like to thank NetGalley, the publishers and the author for providing me with a draft proof copy for the purpose of this review.
145 reviews5 followers
Review of advance copy received from NetGalley
June 9, 2026
Cold Sunset this is the third book featuring Gabriel Dax the reluctant spy. I really enjoyed the first two and this book is written in the same style which is good news.
Despite always bemoaning how his handler Faith Green keeps manipulating him into simple jobs that are nothing but , he is becoming more and more accomplished as a spy. The main thrust of this book is in helping to exfiltrate a double agent from Russia back to England and safety. Again his main job as a travel writer gives him some cover and excuse for being in foreign lands. Towards the end of the book Gabriel realises his life is in danger and escapes for a while. He seems quite content with his solitary basic existence for months and seems to have no wish to return to England. However his past catches up with him again and he is forced to leave so we never know if he could stayed there forever. Back in England there is still the question as to the identity of a new double agent although the writer seems to have hinted strongly as to who it could be but Gabriel does not consider this.
I am not sure if this is the final book in the series but I think that it would be a good time to end it. There was time when helping Kit Caldwell to escape when I wondered if I had read this before as it felt similar to an escapade in one of the earlier books.
But overall I really enjoyed the series with delightful writing an interesting plot and a very interesting Gabriel .
Thanks to NetGalley and the publisher for the ARC.
Profile Image for Sarah.
487 reviews34 followers
Review of advance copy received from NetGalley
June 4, 2026
‘Cold Sunset’ has definitely been worth the wait. This is possibly the best of the Gabriel Dax trilogy. Gabriel realises that he is slowly becoming more of a spy than a travel writer even though the latter continues to be his profession. He recognises that ‘…something colder and harder [was] growing in him, a carapace forming. Were unsuspected transformations in his nature occurring after all the jeopardy and violence he’d gone through …?’ Boyd is clearly interested in exploring the psychological and emotional price that must be paid when one enters a world where nothing is as it may seem.

In this novel, Gabriel is sent first to the States to hear the confessions of an MI6 traitor and then to Russia to help extricate defector Kit Caldwell. As ever, his handler Faith Green is the puppeteer, expertly ensuring that Gabriel dances to her tune. However, Gabriel has also developed skills to be able to fend for himself when he becomes a target. As ever, William Boyd creates a convincingly murky world in which thinking several steps ahead is mandatory for survival. And what an ending – so apposite. This is a really well written and superbly paced spy novel. William Boyd promised us a trilogy; Gabriel Dax will be sorely missed if he really does disappear for good.

My thanks to NetGalley and Viking for a copy of this book in exchange for a fair review.
Profile Image for Pgchuis.
2,473 reviews44 followers
Review of advance copy received from NetGalley
June 13, 2026
I received a copy of this novel from the publisher via NetGalley.

3.5* rounded up. This is the third in the series about hapless double agent and travel writer Gabriel Dax, and it refers back to the first two novels a fair amount. Once again Gabriel is sent on missions which allegedly require his travel writer cover. I enjoy these very much, but they are really 'cozy' spy novels. Gabriel leads a charmed life and here again emerges unscathed from perilous adventures.

I felt the descriptions of Gabriel's sex life took up more page space than was really merited (Lorraine appeared briefly in this book solely so that Gabriel could sleep with her) and his obsession with Faith, his boss, is very school-boyish. The shape of the narrative was odd - it seemed to me that it should have ended after the Norway section, but instead there was a lengthy chunk in Greece which wasn't terribly interesting initially. The ending was more unresolved than I like, but I look forward to the next instalment.
188 reviews7 followers
Review of advance copy received from NetGalley
June 14, 2026
This series gets better each time. This third in the Gabriel Dax novels sees Gabriel, newly returned from his adventures in Berlin (the subject of the second novel), tasked with helping a triple agent escape from Moscow where he apparently defected some years ago.

Our reluctant and slightly bumbling spy is becoming more and more accomplished. I very much enjoy the 1960s settings - the lack of technology makes it much easier to be a bumbler in the spying world, and the nods to Bond. Like Bond has many affairs, and his drinking and smoking are both prodigious. There is an island interlude which did remind me a little of Bond's memory gap sojourn in Japan.

Shooting and killing are becoming more pedestrian for Dax but his obsession with Faith Green continues unabated. I do hope to see more of Dax, the hints about the yet to be exposed double agent working in MI5 are worth completion.

Definitely a recommended read, it does stand alone but is better read as the third in the sequence. Many thanks to netgalley and the publisher for a review copy.
This entire review has been hidden because of spoilers.
60 reviews
Review of advance copy received from NetGalley
June 21, 2026
The books keep getting better and better!

This instalment in the Gabriel Dax series shows that, despite still earning his living as a travel writer, he is developing spying skills and survival instincts.

His lover and boss sends him to the United States to hear the confessions of an MI6 traitor, and then to Russia to assist in the extraction of a defector. Throughout this tale, the travel writing evokes a strong sense of each location he finds himself in.

Gabriel's experience helps develop his survival instincts when he himself becomes a target. Expertly paced and crafted to create a rich novel with a unique atmosphere, tension, and memorable events.
The ending left a loose thread, so I hope there will be another outing for Gabriel to see whether people are the honest patriots they claim to be.

I have read many of William Boyd's novels over the years, and they keep getting better. The Drax trilogy has been superb, and I hope another one comes along. Another 5-Star read.
Profile Image for Heather.
528 reviews
Review of advance copy received from NetGalley
June 20, 2026
It is 1964, and Gabrial Dax, travel writer, and reluctant spy/double agent, a is settling back into his life in the country after his adventures in Berlin.
However Faith Green his handler/lover has other ideas, and he is soon off to sunny California to make contact with an English writer who may be a traitor. This meeting leads to further complications and a trip to Moscow to renew his acquaintance with Kit Caldwell.
Needless to say, that trip does not go as planned and he becomes very aware how dangerous his life has become.
Gabriel gives the impression of an innocent abroad, never in control of his life, even when he thinks he is, and Faith is always hovering in the background.
I enjoyed the book immensely, but the ending made me feel that there is a lot more on the way for Gabriel, and it felt unfinished.

Thanks to Netgalley and Penguin Random House UK for the opportunity to read this book.
Profile Image for Chris Chanona.
287 reviews7 followers
June 5, 2026
This is the third of William Boyd‘s Gabriel Dax novels that I’ve read and this one was just as good as the first two. Gabriel Dax is a reluctant spy who ends up in dangerous situations despite really just wanting to get on with his travel writing. The fact that he is a travel writer gives him a useful alias allowing him to travel to cities and in this particular book Moscow and St Petersburg feature.

I don’t want to give away any spoilers. Just to sayWilliam Boyd is a great writer. Sometimes I wish Gabriel had fewer sexual encounters. Is he really that irresistible? Touch of James Bond here. He is also annoyingly naive at times.

I highly recommend this series of books. I raced through reading this one and was disappointed when it finished. I received an ARC from NetGalley and the publishers for which I’m grateful.
Profile Image for Gordon Smart.
Author 5 books4 followers
June 5, 2026
I read this latest Gabriel Dax spy novel in a couple of days and couldn’t put it down. William Boyd is clearly having great fun writing this series, indulging his affection for James Bond. Like Ian Fleming’s hero, Dax is fond of alcohol and women and, like Bond, attractive women throw themselves at him wherever he goes.
This story opens with Dax enjoying life in California, producing another of his travel books, but he is dragged back into the world of espionage by the enigmatic Faith Green, his boss, and lover, in MI6. He then is sent to Russia on a mission which of course leads to more adventures.
It’s all great fun with plenty of scope for the details of the period in fashion, cars and so on.
Thanks to the publisher Penguin Random House and Netgalley for an ARC in return for an honest review.
I greatly enjoyed it and can’t wait to read another Gabriel Dax book.
Profile Image for Jeff.
498 reviews9 followers
Review of advance copy received from NetGalley
May 29, 2026
I found my love for spies in the mid 80s as early teen when a friend invited me to go see “For Your Eyes Only”. I think I have ordered my Coca-Cola “shaken, not stirred” ever since. I haven’t really tried to go back and read Ian Fleming’s work. They came out before I was born. Reading “Cold Sunset” gave me the since of being able to live in that time period and read them as they were released.

William Boyd’s “Cold Sunset” was so much fun. Gabriel Dax was an enjoyable spy to get behind. Reading his thoughts and his gut-wrenching emotions was a huge plus when reading this book.

I hope there are many more novels in this series to come.

Thank you to NetGalley and the Publisher for providing an ARC for an unbiased review.
724 reviews42 followers
Review of advance copy received from NetGalley
June 2, 2026
This series just gets better and better and proves that wonderful writing, great characterisation and a more thoughtful approach can work just as well as all action derring-do.

Like the first two books and it does help to have read them first - and anyway if you don’t you’re denying yourself a real treat - this is a slow burner that takes its time to develop but is an exceptionally good and worthwhile read.

Dax is certainly the thinking man’s James Bond who always gets into and out of the scrapes his hard bitten handler gets him into.
Profile Image for KDRBCK.
7,675 reviews71 followers
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June 7, 2026
Cold Sunset by William Boyd is the third book in the Gabriel Dax world. The book is published by Grove Atlantic Publishing.
Gabriel Dax's accidentally profession is becoming a spy and his latest case leads him on a dangerous goose chase. Complicated, complex, intense and mysterious, exceptionally well written, the story had me in suspense from start til the twisty and unexpected end.
5 stars.
Profile Image for Tom Matthews.
20 reviews3 followers
Review of advance copy received from NetGalley
June 1, 2026
The third novel with travel writer accidental spy Gabriel Dax.
Set in the early 60's and the world of Philby, Russia and double spies, it is a well written thriller with wonderful characters and shifting loyalties.
117 reviews1 follower
Review of advance copy received from NetGalley
June 15, 2026
The third and final instalment of the trilogy and yet another brilliant stylish spy thriller. The reluctant spy Gabriel Dax continues to intrigue and create tension. This is sharp and rich with detail making for an enthralling read. Highly recommended.
55 reviews2 followers
Review of advance copy received from NetGalley
May 31, 2026
Very entertaining spy thriller by a master. Thanks to the author, publisher and NetGalley
144 reviews11 followers
Review of advance copy received from Publisher
June 14, 2026
I love the Dax series they are so much fun. I felt deflated by the ending I think a bit more space should have been given to the final twist personally. But I will read every one of these Boyd writes
Displaying 1 - 17 of 17 reviews