Robots and Empire

The 4th novel of the series that began with the Caves of Steel, humanity has resumed space exploration and is now operating far beyond the spacer world described earlier in the series. There are over 50 colonized worlds including Solaria, now only inhabited by a robot population. A person threatens Earth with a weapon of mass destruction.
Author: 
Isaac Asimov
Genre: 
Fiction
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Year: 
1985
GoodReads: 
4.14
ISBN-13: 
9780586062005