This book is not a love story but a character study. It's a meditation on professional dignity, and what happens when you sacrifice everything - every opportunity, every chance for connection, for human emotion - on the altar of that dignity. It's a book about misleading yourself. It's a book about giving in to sunk costs.
The last few pages are what made this story work for me. Because Stevens is a sympathetic, if deeply frustrating, narrator. I was rooting for him to have some kind of growth, to leave him ready to grasp the remains of the day. And it seemed like Ishiguro was leading him there, showing him reconsidering the value of bantering (and thus, human connection). But the very last thing Stevens thinks is how this will make him a better butler. Because in the end, he is too scared to be anything but what he has always been.
Superbly done by Ishiguro.