The protagonist is a very ordinary man, rather than the more typical space opera hero. This book takes place in the same universe as the Foundation series. Earth is part of the Empire of Trantor, later the setting for Hari Seldon's invention of psychohistory.
He would explore it most fully in Robots and Empire. Pebble in the Sky has been grouped along with The Stars, Like Dust and The Currents of Space as the so-called Galactic Empire series.However, these are only loosely connected, occurring between the era of the Spacers and the Foundation series, but not otherwise overlapping in time, location, or theme. In this work, unlike The End of Eternity, the time travel is one-way and uncontrolled. It is unlikely that the technologies are related, since, according to Andrew Harlan, the energy requirements for transporting a human with the Eternity's technology far exceed the capabilities of twentieth century Earth.
One element of the novel Asimov was particularly fond of was the inclusion of a scene of exposition conducted over the course of a game of chess between two of the characters. By recounting all the moves, Asimov reacted against the common tendency of novelistic portrayals of chess games to neglect the action on the board. The game that he chose to present was a victory by Grigory Levenfish (black) over Boris Verlinsky (white) in Moscow in 1924, one which gained the victor a brilliancy-prize.