Catseye
Deported from his own planet in a galactic war, Troy Horan was permitted to hire out as a daily laborer on Korwar, where he had been relocated. Temporary work in a strange interplanetary pet-shop led Troy to the realization that with certain animals, he could hold wordless communicaton.
Why were these animals being brought to Korwar?
Who was the controlling agent they feared and hated?
The night on which the pet-shop owner was killed, a few of the pieces in the puzzle fell into place. Just enough to involve Troy personally, and force his escape to a dead underground city and a bid for freedom that challanged time itself and the plans of mighty planetary rulers.
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Andre Norton
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.
Dipple/Korwar
Dipple/Korwar consists of two primary books, and includes one additional book that complement the series but is not considered mandatory reads. The current recommended reading order for the series is provided below.

