Sleeping, eating and watching TV shows. This is the routine that defines the life of Clara, an 80-year-old woman who lives alone on the outskirts of Madrid, in what was once her family home. Now, with no family and no friends, Clara can only take refuge in a small ritual that gives her the will to go on.

The most terrifying fears creep into a little girl in her room when the lights turn off, just before she goes to sleep. Her father tries patiently to calm her; however, the darkness and the unknown are much more powerful and voracious. There's something even worse there, that hides a frightening reality