In any book, the author must introduce the characters, the situation, and the basic elements of the setting, but in fantasy and science fiction you might have a viewpoint character in the first chapter who isn't even human, living on a planet that isn't even in this universe. The very laws of physics might be different, never mind the differences in culture, history, civilization, and everything that goes along with that: systems of measurement, idioms, naming conventions, philosophical principles, mathematics, science...speculative fiction strives to introduce and immerse a reader in a world that might be completely different from that with which we are familiar.
Of all seven Cradle books that have been released so far, Ghostwater was my favorite. This novel delivered on all of the promise that I perceived when I read the first book. It has the most robust character development of the series so far, digs into the technical details of the magic system, instead of just building out to the next level, and it gives insight into some fascinating aspects of the world and the story that have only been alluded to before. Perhaps most strikingly, it is drastically more imaginative than other books in the series, which is a testament more to the level of imagination involved here, than it is an insult to the imaginative level of the other books.