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!