MirrorMask is a 2005 fantasy film designed and directed by Dave McKean and written by Neil Gaiman from a story they developed together, starring Stephanie Leonidas, Jason Barry, Rob Brydon, and Gina McKee.
The film's story revolves around a young girl named Helena Campbell, who is sick of her family's career as circus performers. Helena's mother is hospitalized after they have an argument, and Helena finds herself trapped in a fantasy world shortly after.
She learns she are in the City of Light which is slowly being consumed by shadows, causing its widely-varied citizens to flee. Soon Helena is mistaken for the Princess. She and Valentine (from the dream-like "Realm of Masks") are taken to the Prime Minister. He explains that the Princess from the Land of Shadow stole a charm from the City of Light, leaving their White Queen in a state of unnatural sleep and the City vulnerable to the Shadows. Helena notes the resemblance of the Queen and Minister to her mother and father, and offers to help recover the charm along with Valentine. They are unaware their actions are being watched by the Dark Queen who has mistaken Helena as the Princess of the Land of Shadows.
