The book began not with a pitch or an assignment but with a chance conversation in 2023, on a London film set where Keefe was observing production on the ‘Say Nothing’ television adaptation. A guest of the episode’s director mentioned that friends of his, Matthew and Rachelle Brettler, had lost their nineteen-year-old son Zac when he went off the balcony of a luxury building overlooking the Thames, and that after his death his parents discovered he had been living a secret life as ‘Zac Ismailov,’ pretending to be the son of a Russian oligarch. Keefe heard just that much before the conversation moved on.

Patrick Radden Keefe

I knew that if the family were up for it, this would be my next thing. ‘I’m going to clear the decks.’

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ocregister.com, “A teen’s mysterious death led to Patrick Radden Keefe’s ‘London Falling’”

Once Keefe started researching the Brettlers, he found a second thread pulling him deeper: a pattern of reinvention that ran through every family connected to the story. Both of Zac’s grandfathers had survived the Holocaust and arrived in England as teenagers with nothing. Akbar Shamji’s father had been expelled from Uganda under Idi Amin. The city itself had been remaking its identity for decades. That convergence is what turned a New Yorker profile into a book.

Patrick Radden Keefe

I started to think about Zac’s transformation into Zac Ismailov, billionaire son of a Russian oligarch, and the notion of self-reinvention in general. And then I started to think about how London had reinvented itself in recent decades. [paraphrased from audio]

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New York Times Podcasts, “Patrick Radden Keefe on the Mystery at the Center of ‘London Falling’”

Keefe has two adolescent sons with a similar age gap to Zac and his younger brother Joe. That biographical fact did not stay in the background as he reported the story.

Patrick Radden Keefe

As I talked to the Brettlers, part of what I was experiencing honestly was a feeling of kind of there but for the grace of God go I. [paraphrased from audio]

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The Late Show with Stephen Colbert, “Late Show Book Club with “London Falling” Author Patrick Radden Keefe”

That personal current of dread gave the reporting a quality distinct from his earlier books, which had centered on crimes and crises that felt, by design, at a safe remove from his own life.

Most of Keefe’s previous books were built around subjects who were dead, unreachable, or hostile. Here the Brettlers opened their lives to him completely, and the access was unusual in a specific, material way. In the days after Zac first went missing, Matthew Brettler, an analytical person who knew a crisis was degrading his memory, had begun recording conversations on his iPhone: calls with the police, with private investigators, with Akbar Shamji. He eventually handed all of those recordings to Keefe.

Patrick Radden Keefe

In some cases, the iPhone recordings were quite different from the way they remembered it, because their memory was kind of 20/20 hindsight. [paraphrased from audio]

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New York Times Podcasts, “Patrick Radden Keefe on the Mystery at the Center of ‘London Falling’”

The gap between what the recordings captured and what the Brettlers later believed had happened let Keefe write in what he described as a very intimate, close third-person fashion, placing the reader inside those phone calls as they actually unfolded.

Before accepting the Brettlers’ cooperation, Keefe had a conversation he considered non-negotiable. ‘Say Nothing’ had ended with him identifying the person responsible for Jean McConville’s murder, an unusually clean resolution. He was worried the Brettlers, knowing that book, might assume they were trading their openness for a similar answer about what happened to Zac.

Patrick Radden Keefe

I don’t want you to do it in some unspoken expectation that if you do, what you’ll get in exchange is that I will crack the case. [paraphrased from audio]

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Pan Macmillan, “Patrick Radden Keefe: The Writing Process”

Once writing began, Keefe enforced a strict separation between the people he had come to know and the prose he was building about them. The Brettlers found some details in the finished book uncomfortable. He included them.

Patrick Radden Keefe

When I sit down to write, I’m not writing for the people that I am writing about... You have to see it in a kind of a cold, almost clinical way... you can’t have the impulse to censor in order to protect their feelings.

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thenerve.news, “Author Patrick Radden Keefe: ‘I don’t take lightly the fact that the book will be in their lives for ever’”

The book’s architecture took shape around the Thames. Zac died in the river, and Keefe decided early to open with a compressed history of London told through the waterway, drawing on Dickens’s sense of the river as both the city’s artery and an image of death. A New Yorker colleague warned him that the Brettlers’ story was a slender thread and cautioned him to judge exactly how much historical material it could hold before collapsing.

Patrick Radden Keefe

Now more than ever — in a moment in which we have an assault on the press, we have an assault on the idea of objective truth, we have increasingly the prevalence of AI slop, in which people doubt the things that they see, the fundamental cornerstone of truthfulness that my whole profession and the kind of writing I do is built on — it feels more essential and important than ever.

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ocregister.com, “A teen’s mysterious death led to Patrick Radden Keefe’s ‘London Falling’”

That conviction explains the book’s extensive endnotes, which Keefe treats not as academic decoration but as a public record: every claim sourced, every inference flagged, in a moment when the distinction between documented fact and fabrication has become politically contested.

Keefe is precise about what the book is arguing beneath its mystery plot. The question is not simply what happened on a balcony one night in 2019, but what it means that a nineteen-year-old with real opportunities chose to spend months performing a fiction of inherited oligarchic wealth.

Patrick Radden Keefe

The book is really about reinvention. It’s about the way in which the city of London reinvented itself over the last few decades to become the kind of place where a kid who sort of has everything and a lot of opportunities ahead of him would aspire to be the son of a Russian oligarch.

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bostonglobe.com, “Patrick Radden Keefe talks Dorchester roots and storytelling | Starting Point”

The reinvention theme extends beyond London’s financialization. When Keefe traces the lives of Zac’s two grandfathers, both Holocaust survivors who arrived in England as teenagers with nothing, he finds a very different kind of self-invention: one born of catastrophic loss rather than aspiration toward glamour.

Patrick Radden Keefe

It’s not just that London has reinvented itself. That’s part of what the book is about: that London is also a stage for reinvention in a sort of wonderful way. You have these people who come from other corners of the world, and they arrive in London — in the case of Zac’s two grandfathers as teenagers — and they’ve lost everything and they have to say: ‘Who am I going to be?’

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thenerve.news, “Author Patrick Radden Keefe: ‘I don’t take lightly the fact that the book will be in their lives for ever’”

The parents’ search for the truth of what happened sits alongside a harder question that has no clean answer: how well can anyone know a person they raised? Keefe gave the Brettlers no promise of resolution before they cooperated, and the book honors that honesty. He has a theory of what happened the night Zac died and lays it out, but smaller details stay open.

Patrick Radden Keefe

Now, though, London or New York feel more like Mexico did to me 15 years ago. There’s this sense that maybe it was a murder, maybe a conspiracy, maybe someone was working with authorities, maybe people at the highest levels were involved. But we’ll never know.

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interviewmagazine.com, “Patrick Radden Keefe on the Architecture of a Lie”

That willingness to land in ambiguity, after a career in which he has often delivered accountability and resolution, may be the book’s most honest reckoning: some cities, and some deaths, are engineered to stay opaque.