“This goes much deeper than an old scientist trying to decipher a message from another world. Sarah Halifax is counted on to decode the message and send a reply, but at 87, it will be her last message to the other planet. The powers that be have a way for her to be alive to continue her correspondence with the aliens.
This goes into the psychology of Sarah Halifax and her husband Don as they deal with the rollback process which is to make them younger. ”