I do like the idea of Stephen King multi-verse. all the movies are their own worlds were other stories connect, and the "dark tower" is supposed to separate and protect them all from this "dark outer realm" that these creatures that infest and,plague most of the king stories example: the mist, it, the stand etc. but because of the man in black "who by the way is Randall flag" is attacking the towers and letting these monsters slip into those worlds. And that is why Pennywise the dancing clown is actually a giant spider. Our heroes with the "shining" ability have been put through out king's stories to help protect the the dark tower. I would have liked these movies to have put more emphasis on that. possibly leading to a much larger story.