"The Blackcoat's Daughter" is a psychological horror film directed by Oz Perkins. The story revolves around two girls, Kat and Joan, who are left at their boarding school during winter break. As they wait for their parents to pick them up, strange occurrences unfold, leading to a dark and unsettling atmosphere. The film explores themes of isolation and the supernatural, with a focus on the characters' psychological states. As the narrative unfolds, secrets are revealed, and the connection between the girls becomes increasingly sinister, culminating in a shocking climax that leaves viewers questioning reality.