A Paris model must return to Madrid where her grandmother, who raised her, has had a stroke. But spending just a few days with this relative turns into an unexpected nightmare.

Álex and Abraham have a close and long-standing friendship, sharing secrets and fears as well as schoolwork. When Abraham starts going out with Anchi, a girl at their school, he begins to distance himself from Álex, who spirals into a living hell where he encounters strange apparitions, nightmarish visions and extreme situations that place his life in jeopardy.