Jim and Elly Mae travel to a distant planet as guests of Tiro and Mer - members of a super-intelligent race of Ka'ats. On this strange world, work is done by machines, which are controlled by thoughts from the Ka'ats. But Jim and Elly cannot learn this power and become dependent on their hosts for everything-even meals! Determined to find their own food, Jim and Elly explore a nearby city where human-like beings once lived. But fierce robots now march down the streets. Tiro and Mer rush in to protect their human friends and are kidnapped by the robots. Jim and Elly must use all their courage and wits to find a way to rescue the Ka'ats.
Andre Alice Norton (1912-2005) was an American science fiction and fantasy author (with some works of historical fiction and contemporary fiction) under the noms de plume Andre Norton, Andrew North and Allen Weston. Norton published her first novel in 1934, and was the first woman to receive the Gandalf Grand Master Award from the World Science Fiction Society in 1977, and won the Damon Knight Memorial Grand Master Award from the Science Fiction and Fantasy Writers of America (SFWA) association in 1983.
Andre Norton. Wikipedia.