Katia and Victoria are sisters and scholarship students at a private boarding school. While Victoria tries to fit in, Katia is unapologetic about her quirks, even though their classmates tease her. After a big fight, Katia runs away from school. And when Victoria goes looking for her, she accidentally tumbles into the underworld of a nearby graveyard. It is inhabited by ghosts, ghouls, and a man named Nikola, who is preparing a sinister spell that's missing one key ingredient. Victoria teams up with adorable Little Ghost and Nikola's kindhearted son, and together they search for Katia who is in danger of becoming Nikola's next victim!