This review will most likely contain spoilers for any previous books in the series, read at your own risk.
This book has a nice intro from Asimov talking about cyborgs that is quite interesting. I always like reading these. Derec and Katherine have proven they didn’t commit murder, and stopped the rapid expansion of the city. They still stuck in Robot City though and are still searching for a way out. They are sidetracked by a rogue cyborg that escaped from a medical facility. I like the repercussions that are explored by transplanting a human brain into a robot body. The book goes by really quickly with lots of action and a few tidbits of information to keep the main plotlines going also.