Hugo and Nebula Award champion Rollback is ‘a book to become savored by technology fiction and mainstream readers alike’ (Globe and Email). Dr. Sarah Halifax gained worldwide popularity for deciphering the first alien message received on the planet. Now nearing the end of her times, she discovers that, finally, the reply offers come. ‘Likeable people facing big ethical dilemmas . [a] smoothly readable near-future SF book.’-Publishers Weekly, starred review