In a quiet house, Leonor spends her days in near-constant solitude, while her mother, Diana, works tirelessly around the clock to support them. One night, after a terrifying experience in her room, Diana tries to comfort her by giving her a puppy, hoping its companionship will help her sleep peacefully. At first, the dog becomes her refuge and inseparable companion. But when the shadows begin to move again and the strange noises return, Leonor will discover that not everything that licks her hand in the dark is her pet.