A young female FBI agent joins a secret CIA operation to take down a Mexican cartel boss, a job that ends up pushing her ethical and moral values to the limit.

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In the lawless border area stretching between the U.S. and Mexico, an idealistic FBI agent [Emily Blunt] is enlisted by an elite government task force official [Josh Brolin] to aid in the escalating war against drugs.

Led by an enigmatic consultant with a questionable past [Benicio Del Toro], the team sets out on a clandestine journey forcing Kate to question everything that she believes in order to survive.