Usually, in movies based on books fans of the series always start by comparing the book to the series, well the latter should be based on the books, right. Yes, but nowadays this is not the case. In most cases this is an interpretation of someone else's view. Then why do they say that it is based on the books? That is the case in the new Netflix series about Geralt from Rivia, monsterslayer. If you really like the books and the games, because CD Project Red made an amazing job continuing a story and not rewriting it, then you are not going to like these series. Not to contain spoilers, I can start with details from the trailer, like the medallion & Tris, which are definitely disappointing for me. Well, you can think, these are just small details that are not that important for the story, well I am not on the same opinion. For a show that was supposed to be true to the books these changes are a disappointment to the whole story. Imagine your favourite book from your childhood or teens, then change part of the characters or the plot that lead to the whole story being awesome, then this is not your book anymore. So I think that these series are inspired by the books but nothing more, just another series trying to exploit a good story.