Let's just get this out of the way: lots of people are going to say that The Peripheral is William Gibson's return to science fiction. But what do they mean when they say that? Is it that he's gone back to writing about some future time decades ahead of our own, extrapolating current technology into a future world where cheap consumer goods are made to order on 3D printers and paparazzi operate through tiny drone cameras?
Sure; by that definition, yes, Gibson is writing science fiction again. But he never really stopped. Although what's variously known as the Blue Ant trilogy or the Bigend trilogy is set in the first decade of the twenty-first century (9/11, the Iraq war, the financial crisis), it's rendered in queasily paranoid tones that make “our” world nearly as unfamiliar and otherworldly as cyberspace might have seemed in 1984 or portable VR goggles in 1993. Gibson is of the school of thought that science fiction is necessarily about the present in which it's written, and The Peripheral, future setting notwithstanding, is in keeping with that philosophy. There are damaged young war veterans, a pervasive surveillance state, drones of all kinds, drastic economic inequality, and a powerful sense of impending manifold catastrophe.
[Spoiler-free review follows]