Her son and Anna move to a location in a giant flat building after having an abusive husband. Terrified her ex-husband will locate them she buys a baby monitor to maintain in any way times within her kid's room. But the baby monitor is echoed in by noises from anyplace in the building. Reliving the nightmare she escaped, Anna will need to figure out what's real and what's not until she loses her sanity and her son or daughter.