Hugo and Nebula Award-winning author Robert J. Sawyer writes imaginative SF novels that have earned him an enthusiastic following. Set in the near future, Rollback is "a novel to be savored by science fiction and mainstream readers alike" (Globe and Mail).Thirty-eight years ago, Dr. Sarah Halifax earned worldwide fame by deciphering a radio transmission from an unknown intelligence reaching out from deep space. Now 87, Sarah receives news that, at long last, a new signal has been received, and her services are desperately needed once again.But Sarah needs to stay alive long enough to decode the message. With the aid of corporate backers, she and her husband undertake an incredibly costly medical process called a Rollback, in which decades may be added to their lives - but only if it's successful.