Nacho and Memo start working as night watchmen in a Tequila factory. It is a stormy night. As soon as they recognize themselves alone in the middle of the huge industry, they get ready to drink and then they discover an intruder inside the facilities. It is Don Catarino, an old beggar who lives off the mercy of the employees and is the one who warns them that a lost soul usually appears in that factory on stormy nights. He pleads with them to ignore her and not allow her to involve them in her troubles. As soon as he disappears, a woman asks them for help to shelter from the storm.

The film centers around the drama of Karina, the sole survivor of a series of brutal murders, however, she has lost her memory due to the trauma she endured. With the intention of discovering the author of the masacre, she initiates an investigation that will lead her to uncover more secrets.