The hero is a 75-year old man who, having lost the love of his life, is amenable to trading his old carcass for a younger, genetically enhanced body so that he can combine the experience of age with the strength of youth and join an outer space military coalition sent to protect human colonies in outer space. Inductees agree to leave their past lives on earth behind, and are promised land on distant human colonies if they live. Injured in battle, he's rescued by a special-forces officer who seems to be a younger version of his wife. She doesn't recognize him, but he's so convinced he has another chance with her that he abandons his unit and risks everything to be with her.
