So, I know roughly what I want the story to revolve around. One day in an old library characters from books in the fantasy/ mythology section start coming to life. The problem is (apart from the world suddenly being overrun by magical creatures), that when they come to earth, they disappear from their own worlds. This is disastrous for the main character, as it means she can't do whatever she needs to do to save her family (or something along those lines). So she needs to get back to her world, and that is what the story revolves around. But what I haven't figured out yet is how or why these book characters are suddenly coming to life. Firstly, I need a reason for why some characters come to life and not others (for example only certain fantasy/mythical creatures come to life, so no human characters) Secondly, how did this happen. I have a couple of rough ideas, such as a human scientist wanting to bring to life one character from one book, but it goes wrong and suddenly lots of characters come to life, but I'm not convinced by anything I've come up with so far. Ideas? Thanks so much for anyone who can help!