Dr. Sarah Halifax decoded the first-ever radio transmission received from aliens. Thirty-eight years later, a second message is received and Sarah, now 87, may hold the key to deciphering this one, too . . . if she lives long enough. A wealthy industrialist offers to pay for Sarah to have a rollback--a hugely expensive experimental rejuvenation procedure. She accepts on condition that Don, her husband of sixty years, gets a rollback, too. The process works for Don, making him physically twenty-five again. But in a tragic twist, the rollback fails for Sarah, leaving her in her eighties. While Don tries to deal with his newfound youth and the suddenly vast age gap between him and his wife, Sarah struggles to do again what she'd done once before: figure out what a signal from the stars contains.

Review

Starred Review. Canadian author Sawyer (Mindscan) once again presents likable characters facing big ethical dilemmas in this smoothly readable near-future SF novel. Astronomer Sarah Halifax, who translated the first message from aliens and helped prepare humanity's response, is 87 when the second, encrypted message arrives 38 years later. To aid the decoding, a tycoon buys rejuvenation treatment for Sarah and Don, her husband of 60 years; however, only Don becomes young again. While coping with the physical indignities of old age, Sarah tries to figure out the puzzle of the second message. The bond between Don and Sarah continues, even while Don is joyfully and guiltily discovering the pleasures of living in a young body again. They want to do what's right for each other and the rest of humanity—for the aliens, too—if they can figure out what "right" could be. By its nature, a story about moral choices tends to get talky, but the talk is intelligent and performed by sympathetic and believable people. Sawyer, who has won Hugo and Nebula awards, may well win another major SF award with this superior effort. Publishers Weekly