A Spatio-analyst lands on the planet Florina to warn the authorities of a threat to their world. For his troubles, his memory is wiped and he is left on the planet unable to function. He is cared for by a local woman and trained to work in a factory. Over time, flashes of memory return, placing him and those closest to him in increasing danger. Asimov delivers an adroit mix of intrigue, mystery, and science fiction in a fast-paced story with solid world-building. It should be noted that this tale is set in the same universe as his Foundation series with Trantor as the seat of the Galactic Empire.