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Lily, Robert and their mechanical fox, Malky, receive an invitation to the show of the incredible travelling sky circus, Slimwood! Of course, they decide to take advantage of the opportunity to see this unique show. But behind the desperate tricks of the amazing bird girl and the boy with lobster claws is something terrifying. In addition, the friends learn that the vigilant circus mistress, Madame Leveaux-Grives, has a terrible plan that involves Lily and her long-held secret. Old secrets become a heavy burden for those who want to fly!

The third part of the teenage series is no less exciting adventure story!