Noemí, a young girl from a wealthy Mexican family, lives in a world of fashionable outfits and bright parties. And when she receives a letter pleading for rescue from her sister, who has recently married, she has to leave her familiar life and go to a mysterious mansion on the top of a mountain. There, among the fogs, she encounters the oppressive atmosphere of a ruined estate, misunderstanding, rejection—and an ancient horror whose secret is carefully guarded by the inhabitants of the House-on-the-Hill.