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.

Detective Castro is called to investigate a string of mysterious deaths at the newly opened Caborca prison, home to the country’s most dangerous criminals. When Juan, a man claiming his innocence in the murder of his wife, arrives, a series of eerie and unexplained paranormal events begin to unfold, deepening the mystery and terror within the prison walls.