Watched the movie at a premiere jointly organised by Singapore Film Society and British Council. The story is about what happened when the mother of a circus family fell ill. The daughter, Helen, was brought to a strange land one night where everybody wears masks and she had to find the Mirror Mask and figure out her way home.
There are several films with a similar storyline about the adventures of a little girl in a strange land, examples would include "Wizard of Oz" and "Spirited Away". MM loses out to WOO in terms of the costume worn by the lead character and to SA in terms of the strange creatures encountered in the land but its artwork is pretty unique as it has a graphic novel feel to it.
Internet Movie Database Link