Arithmetic, start to finish. A straight line through a scatter of house prices, a slope followed downhill, one probability multiplied by another. By the last chapter, eigenvectors, maximum likelihood, and a proof that the two costs the whole field runs on are one principle under two assumptions.
The machine narrates this one itself, dry and unsentimental, and never once claims an inner life. Thirty chapters in nine parts on how a network is corrected, what it forgets, why it stopped remembering and started looking, and what it actually was that somebody asked for.