Shortly after her daughter-in-law gives birth, Zhang Lan discovers that something horrifying is leaking from her body. She immediately calls the police, convinced that her daughter-in-law has been murdered, only to find that the body has mysteriously disappeared. Faced with a woman whose appearance and habits are identical to those of her daughter-in-law, Xu Zhi, Zhang Lan begins to doubt herself. Could she really be mistaken? No—there must be some detail she has overlooked!