On a dark night, Javier desperately calls his mother-in-law Ana to ask about Alison, who has been missing. Javier, trying to remain calm, hides a dark secret.

A young college girl, marked by a quiet and solitary routine, begins to notice subtle hints that something is wrong in her apartment. Everything takes a chilling turn when, after an unexpected encounter with a mysterious stranger, it is revealed that a stalker has been hiding in her home. Now, she must face her deepest fear: that the real danger was always closer than she thought.