Robots and Aliens, Vol. 1 (Isaac Asimov's Robot City : Robots and Aliens, Bks. 1-2)

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.