This is the third book in the second Asimov tie in series. Its one of the better ones of the nine I have read so far, and I actually enjoyed reading it (some of the others felt like a bit of a chore). This one covers a return to Robot City, where an outside force has disrupted the operation of the city for its own nefarious purposes.
Fiction
1990
195
The machinery of Robot City has gone mysteriously awry, and Derek, who has only recently returned, is determined to locate and eliminate the source of this distressing reprogramming