Borderline (1950)

Customs agents are looking for information about Pete Ritchie, who is involved in smuggling drugs into the US. Police officer Madeleine Haley goes undercover in order to gain Ritchie's confidence, and before long she meets him through one of his associates. As she is talking with Ritchie, Johnny Macklin and one of his men burst in, and they provoke a violent confrontation. From then on, Haley is in constant danger as she attempts to figure out everything that is happening in the smuggling operation.