Pebble in the Sky is the last of Asimov's Galactic Empire trilogy, which precedes events described in the masterful Foundation Trilogy. Pebble adds further detail about the Empire of Trantor and the place of Earth within it, thousands of years in our future. Humanity is spread across the Galaxy, inhabiting a hundred million star systems and numbering in the quadrillions. Yet atomic warfare has reduced Earth to a radioactive backwater, despised by the other imperial citizens.
This is the world where Joseph Schwartz, a complacent and mild-mannered tailor, finds himself after being catapulted forward in time as a result of an accident in a nuclear lab in mid-20th century Chicago. He soon meets two brilliant scientists: Dr. Bel Arvardan, who is intent on proving that Earth is humanity's birthplace, and Dr. Affret Shekt, physicist and inventor of the Synapsifier, which can boost intelligence in astonishing ways. They team up to foil a plot that could destroy nearly every human alive in the Galaxy.
The book is not without weaknesses. The future science that drives the plot is often a bit dodgy and far-fetched. Schwartz is propelled into the future as a result of an experiment with crude uranium gone freakishly awry, but how exactly this happens is never explained. Nor does Asimov convincingly describe how the biological WMD at the heart of the plot could actually spread across the Galaxy so quickly without the many technologically-advanced worlds of the Empire discovering a way to stop it. Then there is some of the dialog. Even though most of the book takes place so far in the future that humans have evolved miniature appendices and no longer grow facial hair or wisdom teeth, the characters sometimes lapse into dialog reminiscent of American slang straight out of a bad 1950s detective novel. Dr. Arvardan, for example, after knocking down an obnoxious Galactic lawman who has slapped him, asks: "Any other .. think he can play pattycake on my face?" Ughh. These weak spots make suspension of disbelief a bit challenging at times.
As with the other books in the trilogy, however, Pebble's strengths outweigh its shortcomings. It is a worthy addition to Asimov's pre-Foundation future history and a fun read&
