Borderline

Two Americans are caught in the middle of a drug-smuggling ring in a Mexican border town. Each suspects the other is involved with the drug cartel, not realizing that they both, in fact, are undercover agents. They both find evidence that will send drug czar Pete Ritchie to prison for life. The couple falls in love and are tortured by the prospect of turning each other in to the authorities at the border crossing. MacMurry's icy cool performance and Trevor's jittery energy create a chemistry that ignites this classic film noir. (official distributor synopsis)