Expensive diamonds are stolen but before the thief can fence them he is strangled by ex-con Cueball, who then takes the gems and continues murdering people he believes are trying to swindle him. Dick Tracy allows his girlfriend Tess to act as a buyer for the gems but his plan backfires when she is captured by the homicidal Cueball.
IMDb: http://www.imdb.com/title/tt0038478/