Single woman Nicole (Agnes Bruckner) lives alone in the house where she grew up in her childhood. She has long been estranged from her mother, and has always been in quarrels with her sister Anne (Caity Lotz). Her daughter is entrusted to her friend Liz (Kathleen Rose Perkins) for care. Her life seems to be a mess, but she has to face it head-on. One day, Nicole suddenly lost contact with the outside world. Worried about her safety, Anne rushed over from her residence, but never found any trace of her sister, and strange noises were heard from time to time in the room. This situation intensified, and strange and terrifying events occurred one after another. All kinds of unusual encounters prompted Anne to find the truth behind it all. In this process, the facts hidden for many years gradually surfaced, and the footsteps of death became clearer and clearer...