Isaac Asimov's Robot City: Robots and Aliens Series by Stephen Leigh, Cordell Scotten, Bruce Bethke, Jerry Oltion, Robert Thurston

Ariel follows her lover, Derec, to a planet of robots, where Derec is summoned to solve the mystery of the robots and aliens before a robot war erupts

Based on events in Asimov's novels this book follows the story of Derec Avery and Ariel Burgess. Derec must answer the call of a besieged city on an alien planet, while Ariel finds herself the sole human on a planet of positronic robots and aliens of shocking intelligence.

Beyond Robot City, Beyond Aurora, Awaits A Brave New Galaxy of Robots and Aliens.

Derec Avery controls the web of robotic cities that are scattered throughout the universe, but these cities are not functioning like they should, and some of them are starting to become dangerous. Somebody else is manipulating them; it is Dr. Janet Anastasi, Derec’s mother. In an unintended way, her interference is to the point of provoking a war between humans and aliens. A cataclysm is approaching and Derec has to find a means to avoid total destruction.

Amnesiac Derec, on a galaxy-wide quest for his identity, stumbles upon Ariel Burgess and Dr. Avery, the same man who had obliterated his memory.

A continuation of the popular 'Issac Asimov's Robot City' series of novels, collecting the final two columes in the 'Robots and Aliens' cycle: 'Maverick' and 'Humanity' In 'Maverick', Derec should be able to control the network of robotic cities, but the cities are not working as they should, and they are becoming dangerous. Somebody else is tampering with them - Dr. Janet Anastasi... moreA continuation of the popular 'Issac Asimov's Robot City' series of novels, collecting the final two columes in the 'Robots and Aliens' cycle: 'Maverick' and 'Humanity' In 'Maverick', Derec should be able to control the network of robotic cities, but the cities are not working as they should, and they are becoming dangerous. Somebody else is tampering with them - Dr. Janet Anastasi. Unwittingly, her interference is about to start a war between humans and aliens! In 'Humanity', Derec's quest for identity has led him across the galaxy to slowly rebuild the pieces of his life. Now he must deal with three robots that have no fixed shape, no clear sense of what is a human and what is not. They are his mother's creations, but do her robots spell doom - or salvation? less