A classic Golden Age SF novel by an underrated and largely forgotten author, Edmond Hamilton. I had the honor, as a fan, to correspond with Hamilton shortly before his death. He considered "City..." one of his favorites. Hamilton's 1940s pulp characters live on in the "Captain Future" series of Japanese animated television series. Hamilton's work deserves more attention and await rediscovery by a new generation. He was a great influence on his wife and author Leigh Brackett (best known for her "Star Wars" screenplay). She studied at the feet of a master!