This is an excellent second installment in the Wool short story series. This story has a completely different feel from the first one. We spend most of the story on a walk with 2 people down the entire length of the silo. While slower in pace, it allowed the world inside the silo to expand. And I found it quite refreshing to have 2 60 year olds as the main characters of a book! And not to be spoilerish, but the end was quite surprising and leads right into book 3.