We see a lone space-station run by a human who is longing to be home with his family. He has an accident and is rescued by his clone. The rest is a fascinating peek at how humans may use clones to replace themselves in the future, even though it is an abuse of those intelligent lifeforms. Very interesting twist in the end - I couldn't see how it could have a happy ending and it did.
If there's one thing that I believe about a possible future for humans, it is aloneness, maybe even loneliness. Especially with the rate at which the world is aggressively trying to reduce populations while increasing property.