In a fantasy world of opposing kingdoms, a 15-year-old girl named Helena who works at the family circus with her father and mother, who wishes–quite ironically–that she could run away from the circus and join ‘real life’. But such is not to be the case, as she finds herself on a strange journey into the Dark Lands, a fantastic landscape filled with giants, Monkeybirds and dangerous sphinxes. She must find the fabled MirrorMask in order to save the kingdom and get back home.