When her husband's drug addiction destroys her perfect life, Jane (Maggie Siu) is forced to support herself and her young daughter, Ling, by taking a job as a security guard. One night Ling sees a soaking wet child doing homework at her desk. Eventually, Jane also felt that something unnatural was in the house; strange noises occur with frequency and she feels that an unseen presence is spying on her. Jane soon finds out that the house is haunted.