Flora is a new mum enamored of her baby girl, Iris, even if she arrived a few weeks early. With her husband on deployment, Flora navigates the newborn stage alone. But as the sleepless nights pass in the loneliness of their half-empty home, the edges of her reality begin to blur. Just as Flora becomes convinced she is losing her mind, a surprising guest shows up to help: Flora's own mother, to whom she hasn't spoken in years. Can they mend their fraught relationship? Or is there more Flora's mother isn't telling her about the events that led to their estrangement? As stranger and scarier events unfold, Flora begins to suspect the house is not as empty as she once thought. Is her hold on reality slipping dangerously away? Or is she, in fact, the only thing standing between a terrifying visitor and her baby?