Casey and Ann respond with the cops to investigate a murder scene. It’s a matter of a closed door murder mystery. The body was found with a knife in the back, and all the windows and doors are locked from the inside. Casey points out the old fashioned windows, and one possibility for the murder to have escaped, and leaving the windows locked. Now, who could have done the deed? Why did they do it? Join in as Casey and the cops keep the questions coming as they investigate.

Was it a matter of love, jealousy, skeletons in the closet, or some other scandal? Who are the players besides Mrs Meyers, the timid border in the house? Who is the mystery man with the moustache?

This is going to take a visit to the Blue Note, and a chat with Ethylbert to clear the mind and get to the bottom of the story. Though the boarder is revelling in the attention of being the star witness, Casey smells something fishy with her situation. How could the small, frail woman have committed the murder with the brute force needed to pull it off? Casey has it all figured out, but not without some surprises on his account, and in the end he explains it all.