Black 13 plot
Stephen is the downtrodden son of college professor Barclay. He has led a criminal life since a pedestrian was killed in a car accident in which he was involved. Stephen's crimes are getting more serious; one night he even kills the college night porter. Claire, the professor's secretary, is madly in love with Stephen, but he is more interested in a nightclub dancer. The problems surrounding Stephen are always resolved within the family. But then Robert, the boyfriend of Stephen's sister Marion, calls in a private detective.