First book in the Silo trilogy by Hugh Howey. I finished the 2nd book a couple weeks ago and so far, highly recommend - https://en.wikipedia.org/wiki/Silo_(seri

First book in the Silo trilogy by Hugh Howey. I finished the 2nd book a couple weeks ago and so far, highly recommend - https://en.wikipedia.org/wiki/Silo_(series) https://en.wikipedia.org/wiki/Silo_(series)