While Pebble in the Sky is Book 3 in the Galactic Empire series, it can be read as a stand alone, just as the other two books in the same series.
Overall, Isaac Asimov followed the same story arc as in the other two Galactic Empire series: Some crazy scientist with some odd gadgetry, young male hero that magically puts all the pieces together, desperate female that alternately needs rescuing or bedding. While a fun listen, it wasn’t anything shining. The space opera action was fun, the synapsifier was interesting, the characters one dimensional, the 3 female characters were wives or love interest. In fact, every time a woman walked on scene, everyone’s IQ dropped to 80. Woman walks out of the scene, and the IQs come back up to about normal. Sigh…. Can I blame it on the 1950s?