In post-war England, an enigmatic investigator named Florence Cathcart embarks on a mission to debunk the supernatural phenomena that haunt people. After having lost her partner and spent her life challenging beliefs about the afterlife, Florence becomes a controversial figure dedicated to exposing frauds and deceptions. When a mysterious case arises at a boarding school for boys, where a terrifying specter is rumored to appear, Florence feels compelled to investigate.
Upon arriving at the school, she encounters a gloomy environment filled with secrets. The children are terrified, and the staff seems more concerned about the rumors than the well-being of the minors. As she tries to unravel the truth behind the legend, Florence uncovers a labyrinth of tragic personal stories and repressed emotions, as well as a dark past that resonates in every corner of the boarding school.
As the investigation progresses, Florence begins to experience inexplicable phenomena that challenge her logic, forcing her to question everything she has believed. The confrontation between reason and the unknown intensifies, and the shadows of the past threaten to reveal secrets that she herself was not ready to face. With the mystery growing and the tension palpable, Florence finds herself caught between reality and the forces that could change her life forever.