The singing sisters Pearl and Ruby - prettier than talented - accidentally kill Harry Dunbar and Pearl steals his rare coin collection. Dunbar's widow hire Barnaby to find out if Dunbar did really drown or if he was murdered. While checking out clubs that Dunbar frequented, Barnaby is told that Dunbar left the club with the sisters and when they try to fence the coins it puts Barnaby and J.R. on their trail. After killing Pearl's boyfriend, Harley and framing his co-worker, Lester for the murder, J.R. poses as a friend of Harley and Lester's to trick the sister into confessing their involvement in the frame and murders.
