A single mother and her young son move into an old apartment complex where residents report seeing a child wandering the hallways after midnight. The child never speaks and disappears whenever approached. The son begins talking to the child through the walls and insists the child wants help finding their parents. Strange events escalate: toys move by themselves, doors open during the night, and lullabies echo through empty corridors. The mother investigates the building’s dark history and uncovers a deadly fire covered up decades earlier.