Dr Watson and Sherlock Holmes are on their way to visit Dr Ingleby when they come across a murder scene. The well-dressed man has been stabbed to death and identified as Dr Marsden and appears not to have been robbed. There is no apparent motive and no clues but when they meet with Dr Ingleby and another Doctor, Dr David McKenna Sherlock uncovers a possible connection. 
Duration: 29:04 
Starring: Nigel Bruce, Tom Conway
 Broadcast Date: 19th May 1947