Mickle builds a dense, granular mosaic of the firm’s trials and triumphs, showing us how Apple, built on Ive’s successes in the 2000s, became Cook’s company in the 2010s. Ive, long since knighted, becomes increasingly captivated by opportunities outside Apple — a museum exhibition, a charity auction, an immersive Christmas tree installation — and goes part time in 2015. Realizing this is worse than having Ive either fully present or absent, Cook persuades him to come back, but his heart clearly isn’t in it. Finally, in 2019, Ive leaves for good.

In the epilogue, Mickle drops his reporter’s detachment to apportion responsibility for the firm’s failure to launch another transformative product. Cook is blamed for being aloof and unknowable, a bad partner for Ive, “an artist who wanted to bring empathy to every product.” Ive is also dinged for taking on “responsibility for software design and the management burdens that he soon came to disdain.” By the end, the sense that the two missed a chance to create a worthy successor to the iPhone is palpable.

It’s also hooey, and the best evidence for that is the previous 400 pages. It’s true that after Jobs died, Apple didn’t produce another device as important as the iPhone, but Apple didn’t produce another device that important before he died either. It’s also true that Cook did not play the role of C.E.O. as Jobs had, but no one ever thought he could, including Jobs, who on his deathbed advised Cook never to ask what Steve would do: “Just do what’s right.”

Ive and Cook wanted another iPhone, but, as Mickle’s exhaustive reporting makes clear, there was not another such device to be made. Self-driving cars were too hard, health devices too regulated, television protected in ways music had not been, and even the earbuds and watch, devices they actually shipped, were peripheral, technically and conceptually, to Apple’s greatest product.