Charles Bronson switches from his traditional role as a vigilante to playing an actual lawman in this crime drama. Jeb Maynard (Bronson) is a border patrol agent who is trying to stem the tide of illegal aliens from Mexico into the United States. Jeb is hot on the trail of Hotchkiss (Ed Harris), a "coyote" who brings illegals into the United States for a hefty price and with little concern for their safety. But while Jeb is sworn to keep illegal immigrants out of America, he finds his relationship with Elena Morales (Karmin Murcelo) becoming more than professional. Elena is an illegal alien who wants to cooperate with Jeb by leading him to Hotchkiss, who smuggled her into the United States. But businesslike Jeb soon finds that the plight of Elena and her young son, who are desperate to build a better life for themselves, has touched a soft spot inside him. While the story may sound similar to the Tony Richardson/Jack Nicholson picture The Border, Borderline actually preceded it by two years.