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Borderline is a 1950 American crime film noir directed by William A. Seiter and starring Fred MacMurray and Claire Trevor. It was filmed from late May to early July 1949 at Republic Studios.

Plot

Pete Ritchie (Raymond Burr) runs a narcotics smuggling operation to the USA from Mexico, which the Los Angeles Police Department and the US federal government have unsuccessfully tried to stop. Because of Ritchie's careful operating procedures, US authorities haven't even been able to find out the identities of his sources or customers and are desperate for a breakthrough. As a last resort, Madeleine Haley (Claire Trevor), an LAPD officer and former OSS operative, is sent undercover to Mexico to charm her way into Ritchie's confidence.