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
Sub-par Robot novel. Some interesting ideas explored, but mostly a dull read. This series of novels was sanctioned by the Asimov estate, but in hindsight that was probably not a great idea.
Not horrible, but certainly not engaging.
I'll read the last 3 to be a Completionist, but won't hold any illusions about what to expect.
Isaac Asimov's Robot City, Robots and Aliens book 3, Intruder (1990) 195 pages by Robert Thurston.
Something is wrong with the original Robot City. Derec, Ariel, Wolruf and robots head back to that planet. When they arrive they find the streets deserted instead of busy with robot traffic, flaws in the buildings with further exploration they finally find Bogie a robot that spouts off lines from old movies, Timestep a dancing robot, and small human-like creatures. Unbeknownst to them WatchfulEye is the one that has taken control of the city, disabled the communication with Derec's chemfets and created the experiments that they chanced upon in the city.
As the story progresses Derec and Ariel deduce that someone or something is controlling the city. Derec's first impulse is that it is Dr. Avery (creator of the city, also his father). Thurston takes time with two groups of the tiny humaniform creations having Eve and Ariel study the creatures while Derec and Mandelbrot go in search of the entity that is controlling the city.
Like Robots & Aliens #2, not a masterpiece, but entertaining enough.