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Shift (Silo #2) by Hugh Howey
Amazing sequel. Didn’t know what to expect, which made the surprise even more enjoyable. It’s a continuation of the original story is coherent way — without being a rehash. Managing to give more than simple clues about the origin of the universe created, without ruining the mystery.
Being the second book in a trilogy is always hard because it can sometimes fell like any weak plot point is there as a filler. While this book doesn’t stand on its own (no one said it should) it’s a strong bridge to the last one.