Pan's Labyrinth

In post–civil war Spain, 10-year-old Ofelia moves with her pregnant mother to live under the control of her cruel stepfather. Drawn into a mysterious labyrinth, she meets a faun who reveals that she may be a lost princess from an underground kingdom. To return to her true father, she must complete a series of surreal and perilous tasks that blur the line between reality and fantasy.

Plot summary via TMDB