"The Mortal Instruments" is a young adult urban fantasy book series that had its first book turned into a movie. The movie wasn't successful, but with support from fans, the company that owns the rights to the series decided that making a television series was the best way to give fans what they wanted. Everything seemed great until we learned that the series would be making huge changes from the books. While some changes could be a good thing (like changing the title, making the characters a couple of years older), the bigger changes are not okay with the fans. Since the series will be mostly watched by fans of the books, if the readers aren't satisfied, the series is not going to do well. There are tens of millions of fans of the books that really want to see a well done television series. The plot of the TV series should follow the books, the characterization should stay the same, the setting and mythology should stay the same. We don't want another Vampire Diaries, where the writers take the basic concept of the story and run with it. We want Game of Thrones, where people who have been with the franchise since the beginning can see what they've been supporting for almost a decade. The fans need to be happy with the outcome of the series because if they're not, they won't tell their friends to watch it. The series won't grow and the ratings will plummet. The fans of the books know what they're talking about, they know why the series is so amazing. The writers don't. That's just the way it is. If the producers want to create a series that people will actually watch, start by getting people that already love the book series to want to watch it.