The Naked Sun

Like all Earthmen, Detective Elijah Baley has a terror of open landscape, of the naked sun.

Reacting in fear against the technological superiority of the Outer Worlds, the people of Earth have hidden themselves in vast underground cities, nursing a hatred for Spacers. The fifty Outer Worlds of the Spacers together are home to fewer people than planet Earth. And home to many, many more robots. Earthmen hate Spacer robots too ...

But Baley doesn't. He once had a robot partner, R. Daneel - and when the authorities of the planet Solaria request terrestrial assistance in investigating a murder, Baley is once again teamed with Daneel. He is the first Earthman in a millennium to travel to the Outer Worlds ... and he must endure the glare of a sun far more deadly than Earth's.

THE THREE LAWS OF ROBOTICS

. A robot may not injure a human being or, through inaction, allow a human being to come to harm
. A robot must obey the orders given it by human beings except where such orders would conflict with the First Law
. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law

"'The Caves of Steel' and 'The Naked Sun' are the best books Asimov ever wrote"
THE GUARDIAN