The Miami Beach Cinematheque screens “The Unknown Girl,” which tells of a young female doctor who allows the door buzzer at the small clinic where she works to go unanswered. It’s only later that she learns that the person ringing was an unidentified African woman found dead shortly after by the side of a road. Consumed by the thought that she is to blame, she embarks on an obsessive crusade to discover who the anonymous woman was and to see to it that she is not forgotten. 6:50 p.m. Miami Beach Cinematheque, 1130 Washington Ave, Miami Beach. Details: (305) 673-4567 or mbcinema.com/.