Inés works as a dubbing actress and sings in a choir in Buenos Aires. After a traumatic experience during a holiday trip, she develops a sleep disorder and starts suffering from very vivid nightmares. At work, the studio microphones pick up strange sounds coming from her body, threatening her career and her singing. Inés becomes paranoid as she has increasing trouble telling what is real from what is not. She begins to entertain a dangerous idea: the characters in her dreams are trying to take over her body.