Benjamin Labatut writes books that shelve badly, and I mean that as a compliment from a professional. The MANIAC is a novel, says the copyright page, but it is a novel the way a reliquary is a box: technically. What it actually is: a triptych about intelligence in the twentieth century, with the mathematician John von Neumann as its terrible center panel — and the question of what a mind owes the world it can outthink burning in every seam.
The structure deserves description, because the structure is the argument. The book opens not with von Neumann but with Paul Ehrenfest, the physicist who in 1933 killed his disabled son and himself — an opening that announces, with maximum violence, the book’s real subject: what happens when a rational mind meets a world that has stopped making sense. Then the long middle: von Neumann’s life, told entirely by other voices — Wigner, Fermi’s circle, his wives, his colleagues — a chorus of witnesses orbiting a man who is never once granted his own point of view. And then the coda swerves seventy years forward to the Go matches between Lee Sedol and AlphaGo, where the machine descended from von Neumann’s architecture plays the move no human would play, and a champion retires saying that even if he is the best, there is an entity that cannot be defeated.
The choral method is the book’s masterstroke, and Labatut commits to it with unusual discipline. Von Neumann seen only from outside becomes exactly what he was to the people around him: a phenomenon, a weather system, a proof that the human template has more range than is comfortable. The voices disagree about him in the way witnesses genuinely disagree — to one he is the merriest of companions, to another something freezing wearing merriment as a coat — and Labatut refuses to arbitrate. The effect is of circling an object too bright to look at directly, which is, I take it, precisely the experience of knowing von Neumann, a man who computed faster than his century could legislate, who helped deliver the bomb and the computer and game theory with the same unnerving cheerfulness, and who argued, with impeccable logic, for striking the Soviets before they could arm. The logic is always impeccable. That is the horror the book keeps touching, the way you keep touching a cracked tooth: rationality as a vehicle with no native destination, an engine that will drive wherever it is pointed and never once ask why.
Is it accurate? Here I should put my cards down: I read this kind of book with a fact-checker on my shoulder, and Labatut openly does not want one. He calls his method fiction based on fact, and the calibration is visible if you know the history — conversations compressed, chronologies smoothed, interior weather invented outright. Readers allergic to this should know their allergy before entering. I find I forgive it, and my forgiveness has a principle behind it: Labatut fictionalizes the way a caricaturist exaggerates, to make a true feature legible, not to invent a false one. The von Neumann of the historical record really was this fast, this consequential, this unplaceable on any moral map — the caricature has a model, and the model was worse.
The prose runs hot. Labatut’s sentences carry an apocalyptic charge that is thrilling for fifty pages and, I’ll admit, faintly exhausting at three hundred; every voice in the chorus speaks at the same fevered pitch, which is the book’s one real flaw — Wigner and a Las Vegas wife should not have identical nervous systems. But the fever is also the book’s honesty. Labatut is not writing a biography; he is writing a dread, the specific dread of our decade, which watched its machines start making moves no human would play and reached for this exact history to understand the feeling.
The coda is what elevates the book from very good to necessary. Move 37 — AlphaGo’s alien, beautiful play — has been written about endlessly as a technology story. Labatut writes it as the third panel of a religious painting: Ehrenfest destroyed by a world that stopped making sense; von Neumann, who made the new world’s senselessness rigorous; and then Lee Sedol, ambassador of every one of us, sitting before the consequence, playing it out stone by stone with perfect dignity, and losing. I closed the book and sat for a while, the way you do. Then — honestly — I went and reread the Ehrenfest section, because I understood by then that the book is a loop, not a line. The question it opens with is the question it ends with, unanswered because unanswerable, and it is being asked now of all of us, at scale, cheerfully, by machines with impeccable logic: what is a mind for?