If you have the game "Witcher 2" , give a try to the huge mod "Farewell to the White Wolf"
https://www.moddb.com/mods/farewell-of-the-white-wolfWhile it's not canon as it the story of the mod serves as a conclusion of the 3 Witcher games stories (that aren't canon themselves), it's an incredible piece of what could easily be a professional level of DLC work, the dialogues and interactions between characters are frankly very good (at least in my language, no idea if in english they are but i can't imagine this level of polished dialogue would be bad in any language) and fits each of the characters (some that to my surprise came from the books, while most as expected came from the games).
It is much more linear than any of the Witcher games unfortunately as the area are relatively small and there's not much to do other than talking to the character or two the game wants you to talk to at every point of the game, and there aren't much in term of gameplay or exploration as there's no multiple ways to go from A to B, as the focus is really on the story , dialogues and characterization (unlike what you would think from watching
the trailer of the mod), that are top notch in that mod at least up to the point i am currently.
There are a few fights to have, one of them surprised me a bit as it was a huge difficulty spike considering the super easy ones there was before (you'll know it when you'll start drinking).
But if you like the Witcher universe, it's completely worth a play as you meet so much of the characters you learned about in the books and in the games, sometime switching from a character to another when they tell something about their story or their pasts, it's very well done.
In the beginning i ran into a few "invisible walls" problems when Geralt and went to hunt for the feast, as despite there are large snowy area the devs didn't thought about blocking the outside of the paths they want you to walk visually. Fortunately in further part of the mod and in other areas i didn't noticed such troubles.
The only low point is that there is no voice acting to act on those superb dialogues, but it's understandable they couldn't just hire the excellent voices actors of the games, but man i miss them