This review contains spoilers.
I'm not going to give the story-line here, because that's available in the blurb on the book or in Goodreads. Rather, I'm just laying down a rant because I was really disappointed with this book, expecially given the great reviews it got. I can only imagine that Lee Child and Mick Herron (who both apparently rated it highly) didn't actually read it.
One of my main issues with this book was the exposition. It was just not done very well at all.
Early on the book, after the opening sequence, we get 12 pages of background on a past relationship, which does little to advance the story imo. It could have been shaved to 2 pages, or the relevant detail could have been folded into the story later. A short while later (and later in the book as well) some of this detail is unnecessarily repeated anway, and some other details also seem completely irrelevant - and yet we are not initially told who Peter Nyman works for or what his role is, despite seeming to be critical at this point in the story - it's only clarified later. It seems that much of this detail was covered in previous books in the series and much (but not all of it) recalled for reference, but in an unhelpful fashion.
As an example of completely mundane irrelevance, we also get this kind of unnecessary filler - and remember, this is meant to be an espionage thriller: “Waiting for him...a tray with juice, sliced mango, oval breads called samoon, and gaymer, a thick white cream made from buffalo milk, all prepared by his Yazedi chef.” What? I don’t care - this kind of detail is probably more at home in a fluffy novel about wealthy pop stars or yoga vloggers. You’ve already told me he’s very wealthy, you don’t have to flesh it out with this kind of thing, I have an imagination.
The main character, Samson, seems almost chidishly concerned with the romantic past he shares with another character. The female character he's obsessing about also keeps recalling details about their romantic past (although she's married), and throughout the book (and in the epilogue) we get the two of them thinking and behaving like adolescents about one another. The language and style are more in keeping with a romance than a thriller.
The characters are largely not believable. There's a Russian hood who's meant to be an expert in psychological warfare, but fails miserably at it - he's also quite inept as the woman's captor, getting drunk and attempting to be amorous, in what is a really pathetically-contrived scene to set up her escape attempt.
There are issues with the other characters too (most of them).
Spelling errors in novels are unavoidable, but I would expect the writer of an espionage novel to get the spelling of the “breech” of a rifle correct - he gets it wrong more than once.
The "twist" at the end is pretty weak - the Italian mob, really? And then 15 pages of loose ends being tied up, with some details that really could have been woven into the story.
There are also a lot of repetitive references to certain parts of the back-story, specifically the past activities of Samson (the main character), the billionaire who's hiring him, the female lead, and the kids they saved together in the past. I got a bit tired of this and was on the verge of abanding the book on more than one occasion.
Not recommended.