In the war zone that is the U.S./Mexico border, DEA Special Agent Scott Greene wants justice for a murdered fellow agent, but the killers are outside of his reach, on the other side of the imaginary line that separates one country from another. So he crosses that line and inadvertently unleashes a storm so violent and so stunning that it turns Scott and his only ally, a Mexican cop named Benny Alvarez, into fugitives on both sides of the border as they fight to expose a scheme so corrupt that it could bring down both the U.S. and Mexican governments.