Mr. Keen, Tracer of Lost Persons - The Case of Murder and the Bloodstained Necklace

A man named Austin is knocking at Mrs. Grace Bradley's door in the Metropolitan Hotel. A bellboy is bringing a pitcher of ice water and some glasses to her room. Mr. Austin says "is that ice water for Mrs. Bradley? I don't think she is in. I have been knocking on her door for the past five minutes, with no answer. I have an appointment with her". The bellboy says "that is strange, she just told me on the phone to bring this up right away". Austin asked "do you have a key to this room? We better check to see if she is alright". The bellboy opened the door, and they started looking around the room. Mr. Austin stopped and said "set that tray down and get ahold of the police, quickly". The bellboy asked him "why, what is the matter?" and Austin said "look behind the screen". There lay the body of Mrs. Bradley, dead, with a bullet hole through her neck.