The Woman in the Storeroom

Charlotte is a I would say not so smart girl but in school she is a class chairperson and her charismatic won over most of the students except for Adeline. Adeline is talented and attractive, but she never speaks to anyone in class. If someone angers her, she would stare at them very fiercely and wave her fist hardly at them.
Once, Charlotte and Adeline had a heaty argument and Charlotte could not help but complain to Adeline's mother. The next day, Adeline arms were ennobled with deep scars. With a heart full of enthusiasm, Charlotte hastily broke into Adeline house with the help of the bicycle uncle who tried to divert Adeline's father's attention to himself. Unknowingly, Charlotte found a secret door and inside the had the sound of clinging tangled chains. Adeline house seems to have an unspeakable secret and Charlotte tried to get information from her by being her friend but she found Charlotte annoying does not appreciate Charlotte's help.
In an occasion when Charlotte was about to give up the idea of helping Adeline, she received a letter from Adeline that she needed help badly. But she did not expect this to intervene, which leaded her to find out a tragedy hidden beneath the carpet........