England in 1921 has been haunted by the shadow of the First World War. The female writer Florence has never been able to let go of her fiancé's death on the battlefield. She often joins forces with the police to expose supernatural phenomena and lies with her reasoning ability. On this day, Florence once again received a special visitor, Robert. Robert is a boarding school teacher, because there was a case of students surfing the Internet in the school, but the ghost of the little boy's ghost has been circulating in the school. After hearing this, Florence followed Robert to the school to check, hoping to get evidence, but accidentally discovered the real cause of death of the student. After the students are on vacation, only Robert, the housekeeper and an orphan Tom are left in the school. Another supernatural event occurred in the school, but the truth surprised everyone. It turns out that Tom and Florence are a pair of siblings. After their father killed their mother madly, he wanted to kill Florence who had seen everything. After Tom died instead of Florence, he became The shadow of her heart. Florence remembered it now, but her childhood memories were only scary and crying for her