Tombs of Atuan by Ursula LeGuin is a sequel, but I don't think you need to know anything about the previous book to enjoy it. Going back to the first book would feel like it was a prequel if you didn't know the original publication order. Very different but very enjoyable books on their own or together.
Book 3 is different to me though, you need to have read both books 1 and 2 to get the full experience for it.
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