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Hugo and Nebula Award winner Rollback is "a novel to be savored by science fiction and mainstream readers alike" (Globe and Mail). Dr. Sarah Halifax earned worldwide fame for deciphering the first alien message received on Earth. Now nearing the end of her days, she learns that, at long last, the reply has come. "Likeable characters facing big ethical dilemmas . [a] smoothly readable near-future SF novel."-Publishers Weekly, starred review