"Living in the 10-billion-year-old city of Diaspar, Alvin is the last child born of humanity. He is intensely curious about the outside world. According to the oldest histories kept by the city fathers, however, there is no outside world—it was destroyed by the Invaders millions of years ago.
One day, Alvin finds a rock with an inscription seemingly meant for him: “There is a better way. Give my greetings to the Keeper of the Records. Alaine of Lyndar.” This cryptic message takes Alvin on a quest to discover humanity’s true past—and its future.
Originally published in the November 1948 issue of Startling Stories, Against the Fall of Night is a rich and intensely poetic vision of a distant future that’s sure to delight fans of Clarke and science fiction as a genre."
This one from one of the masters of 20th century scifi, this one pulls down 4.4 stars from 22 reviews. This somewhat short for a KDD, only 130 pages