Steal Across the Sky by Nancy Kress (author of Beggars in Spain and Probability Space) is a different type of alien contact novel. Where most alien contact novels have the aliens either warring with Earth or helping shepherd Earth to the future, these aliens have come to apologize and atone for their actions 10,000 years ago. No one knows what they did, but the aliens (called Atoners) want to help Earth find out.
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