I remember a novel I read ages ago and am looking for its name.
The story starts with the death of our characters wife and he cannot get over it. So he sells everything and buys some land and builds a vault so he can put himself into suspended animation for 50 years. He believes that if the world has moved on maybe he can as well. Everything reminds him of her. The vault is equipped with medical equipment and computers to reanimate and rehabilitate him when he awakes. It describes a long process of exercise etc to get him into shape so he can walk and eat again. I particularly remember that the rats had almost eaten through the door by the time he was ready to leave. He finds he has been asleep for 5000 years He then finds himself in a very different world and he goes on a quest to save the locals. Any help would be great!