In the film Tierra De Nadie: Sicario, the border between the United States and Mexico is one of the most dangerous areas in the world, especially on the Mexican side. There the drug is in charge and the money it produces makes corruption too tempting.
Kate is an FBI agent who will be recruited in order to fight a more dangerous cartel than usual, because she has not had any qualms about killing some agents of the American government.
She is an idealistic woman, very attached to the law, but will soon realize that her idealism does not serve the other side of the border. There she will be integrated with several people who do the same work as she, but leaving aside the law.
Kate will find that the job she has been given is more complicated than she thought. Also, if you want to get out of there alive, you’ll have to forget the law for a while.