It's dark. And blends fantasy and politics very much like his other films Devil's Backbone and Shape of Water. The girl's stepfather is a military officer who often tortures or kills any spy or anti-fascist warrior that comes near him or his home.
Meanwhile, the girl discovers fairies and other mythical creatures, which may or may not be real (is it all just in her head?) But my interpretation is that they are real and interact only with her, and the new world she enters is also a real one, only open to her. I thought it was an imaginative world, at least what we see of it.
Interesting to note: The book version is this month's #1 best-selling book in Germany (source: Publishing Trends): https://www.publishingtrends.com/2019/08/international-bestsellers-july-2019/
Interesting to note: The book version is this month's #1 best-selling book in Germany (source: Publishing Trends): https://www.publishingtrends.com/2019/08/international-bestsellers-july-2019/