The previous reviewer might have waited to see all the episodes before writing. The whole concept becomes clear in the last two episodes, with an "aha" moment. We have seen this idea in many movies. In short, it is the "It was all a dream." concept. Very cleverly done, but I don't know what the age range would be. When is a child able to "get it?" It seems that it takes a more developed brain to be able to backtrack through the first episodes to make sense of the story as a whole. As a very mature adult, and lover of frogs, I'm glad I stuck with it through to the end! I would advise watching all the chapters at one sitting. Great characters. Spooky story. Satisfying ending.