Manuel (Zorion Eguileor) has to move into the house of his son Mario (Gustavo Salmerón) and his family after a terrible event ends the life of his old wife. Little by little, reality imposes itself: something incomprehensible happens to Manuel. The voices that he claims to hear, the presences with which he claims to speak. Lena (Irene Anula), Mario's wife, wants to throw him out of the house: she is sure that something terrible will happen. Only Naia (Paula Gallego), the teenage daughter, is on his side, but even she begins to doubt as strange phenomena occur around her increasingly disturbed grandfather. It's the hottest summer in history, a countdown has begun and it's too late to stop it.