Sawyer is a master of weaving moral quandaries into science fiction tales. In this one an elderly Don Halifax is faced with being given his youth back due to a process called Rollback and seeing all the people that mean anything to him die off including his children while he relives his life. His wife, Sara Halifax was the person who had deciphered a message from an alien race several years prior. The story begins with a new alien message being received and an aged Sara is asked to decipher it again. To allow her to continue the process, a wealthy entrepreneur pays for her and Don to have the Rollback performed so that she will be around each time a message is received. Unfortunately for her, her Rollback fails so we are left with a "25" year old Don married to "87" year old Sara. Don is torn between his love for Sara and the raging hormones that have now been awakened in his body.
The book is a very fast read and the author does a good job of presenting a really significant alien message, once it is deciphered. Sawyer along with Orson Scott Card continues to be my favorite Scifi author.