S1, E3: Thousands of Central Americans head to the US border, lured by a vision of the Promised Land. At crossing points, networks of 'coyotes' wait to get them across. But once in the traffickers' clutches, the migrants are held to ransom payment. Men who can't pay are sold to work off the debt as laborers; women as prostitutes. The story is told from the inside, in the words of the migrants and from the mouths of the cartel foot soldiers.