Despite the title, the sport of hilketa—in which robots piloted by humans try to remove each other’s heads—is not the most interesting part of John Scalzi’s Head On (Tor, April 2018).
Like its predecessor, Lock In (Tor, August 2014), Head On is set in a world where millions of people have a condition called Haden’s syndrome, where they are awake and aware but locked into their bodies. Hadens log into robot avatars called “threeps” (because, yes, they resemble C-3PO) to interact with the non-Haden world. But rather than make the disease and the solution the central focus of this series, Scalzi treats them as background, tucking them away in a prequel novella, “Unlocked.” What he does instead is, to me, much more interesting: he focuses on the knock-on effects of the solution to the epidemic.
Jonathan Crowe blogs about maps at 
