Head On

This a law enforcement story about a murder which takes place in the world of Locked In. However, Scalzi has invented a crisis that did not exist in the previous work, and used that novelty to build a story around. It's not clear why anyone would want to have their mind infested with wires so others could take over their bodies, but that's what the mystery revolves around, so there we have it.

Also, the idea that Hadens would actively want and emotionally desire to take over a real human body instead of living in their own, supposeldy separate but equal humanity, seroiusly compromises the previous contention that Hadens are not inferior, just human in a new way.

As a detective mystery, it's a palatable story. As an evocation of the nature of variant humanity and it's status as equal, the book perverts its own arguments.