Winged creatures in storm clouds

You know how it goes. Elementary school is like a bad dream, especially if you're a bookworm on the cusp of puberty and look a little different than everyone else. You're trying to fit in, or at least survive for a few years. Rebecca believes that nothing will surprise her anymore. But then it turns out that his biggest battle is yet to come. All it takes is one strange encounter and he'll never look at the sky the same again. There is something far darker than rain, thunder and lightning hiding in the storm clouds. What is he actually fighting against? And is there a way to stop it? Maybe he'll end up wishing the storm had never ended.