A thrilling detective story based on a short story by writer Hana Prošková takes place shortly after the war in a castle, where a group of students work part-time to re-register the archive. During long evenings, they sit together and invent a fictional character, the "Ghost", who mysteriously moves around the castle and disturbs its peace. But the recession becomes an opportunity for someone to carry out their evil intentions. Fiction becomes materialized and the danger begins to become cruelly real...