Originally published in two parts, Orphans of the Sky is a brilliant treatment of the concept of a multi-generational interstellar voyage (or "generation ship"). Or, at least the first half is.
In the first part, "Universe," we meet a mostly agrarian society living in the lower decks of The Ship. The civilized Crew (led by the elite Scientists and headed by the Captain) live in the lower (outer) decks where gravity is strongest; the upper (inner) decks are where where gravity is light and the Muties (mutant descendants of the original mutineers) rule.
This is a journey gone wrong...a mutiny shortly after take-off disrupted the ship's society, and after many generations, the crew has forgotten they live on a spaceship...they think of the Ship as being the whole of the Universe. A young scientist, Hugh, learns more when he is captured by the Muties.
"Universe" has been hailed as one of the best and most-important sci-fi novellas ever. It is the first instance of a "generation ship" concept, an idea which has been copied many times. I'm not a particular fan of Robert Heinlein, but this one is great.
I have less good things to say about "Common Sense," the second half of the book. Hugh, now armed with the truth and a cohort of brutal Muties tries to convince the Scientists and Crew about the true nature of the ship, and that they should steer it to its destination. "Universe" was a seminal, ground-breaking work. "Common Sense" finished up the story (if it needed finishing), but I find it particularly unsatisfying.
This is the second audiobook narrated by Eric Michael Summerer that I've heard, and he remains a capable and effective narrator.
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