The Last Wish
I finally understand the whole wish/shared destiny thing with Yennifer and Geralt and that alone was worth the read.
It is better than that though. A lot of the stories were retellings of common fairy tales (including retelling of Beauty and the Beast). That specific story (and you will know it when you read it) was a fantastic retelling that turned the story on its head, without being too hammer to the head.
It is an anthology series that weaves together and I also may think I like that format for Geralt, The Witcher more than the novel I read. I will read all the other books I think, and I hear I will like them, but this book so far is my favorite.