When Kate receives word her estranged mother is unable to take care of herself, she reluctantly returns to pack up her mom's house and send her to a nursing home. Unfortunately, it's a big task: her mother has been a hoarder for as long as Kate can remember. As she cleans, her mother warns: bad things will happen if you take away my things. Kate battles her mother's dementia-driven hostility and uncovers disturbing items underneath the detritus. Specifically: a sinister-looking mold-like mark underneath the wallpaper. As Kate unravels the mystery of her mother's obsession and illness, she discovers that the hoarding was actually self-preservation. There is evil in the house's walls, and they must be covered at all costs. An allegorical tale of intergenerational trauma between mothers and daughters.