That J.R.R Tolkien started working on a sequel to the Lord of the Rings.
He wrote a few pages and had some sort of direction for the story.
The story, which would have been named The New Shadow, was meant to take place around 100 years after the events of the original story, and was, at least in the few pages that were written, meant to focus on the idea that evil never disappears.
Its unclear if the story would have ended up revolving around a new evil, or an existing evil we all know or have heard of. We can't know this since Tolkien never continued the story past the few pages he wrote.
From what i can collect, he didn't feel that this new sequel would have been faithful to the original Lord of the Rings stories, and decided to not continue with it.
I think that even if the story would have ended up the way he felt it was going, fans would still love it anyway. But the fact that he was true to his art and decided to not continue it for the reasons he did is something to be admired.
That is something that is hard to come by these days as many authors, directors, and story tellers in general, have a habit of making sequels to great stories that just don't make sense and aren't faithful to the original story.
Some would say that this is because, if their first story made a good amount of money, they may want to continue the story, even if it ended in the previous story, just to make another profit. Sometimes this works out, sometimes it doesn't.
In any case, its nice knowing that there could have been a continuation to the stories, its quite bitter sweet since we have a very small taste of what it could have been, but never was.