The city and the stars is my first science fiction book I read and it's a great book, it tells the story of Diaspar, a hyperfuturistic city that survived the passage of time believing it to be the last bastion of human life on the planet that once was a great interstellar empire, Diaspar was preserved because of the discovery of memory banks that guarantee immortality and resurrection in addition to an artificial way of life that ensure stability.
The character Alvin finds himself in this context and is the only one who was born for the first time instead of being some of the posthumous resurrections, by this birth Alvin wants to get out of that "perfect" and boring city, wants an adventure or anything that takes him far, and finally with great difficulty and with the help of Khedron he manages to go to another city, Lys, where they live in a more old-fashioned way, with cars, agriculture and the use of telepathy is dispersed and common, Alvin finally feels at home but it has a giant mission to unite the two isolated cities at last and return the human being to his old ambitions of conquering space again, in the course of the book you will see if Alvin in his adventures will really succeed.
The end of the book leaves me with several questions but it is entirely for our own resolution, did Lys and Diaspar succeed in the union, did man manage to return to space, how will Vanamonde be, what will it be like after the Black Sun breaks free and where will be the men who left our universe.
It's a great book and I recommend it without hesitation.