Robots from the robot city encounter a race of intelligent extraterrestrials; and Ariel follows Derec to a planet of robots where Derec attempts to solve a mystery involving the robots and an alien race and thus prevent a robot war.
A man without memory, tied by blood to a city of robots.
Isaac Asimov's Robots and Aliens: Volume one
This pair of robot mysteries, enhanced with a pair of essays by Asimov himself, reflects the colorful world of thinking robots, subterranean Earth dwellers and witty repartee that characterized the Hugo and Nebula Award-winning landscape of ...
Isaac Asimov's Robots and Aliens: Volume two