Summary: If this were a cartoon, Sherlock would have gotten a package in a very large box, then climbed into the empty box and imagined an adventure–like the box is a crime scene he has to investigate. But it isn’t like that at all. A lady gets a box with 2 ears in it, and Sherlock determines that it was meant for her sister, who had recently lived with her. He quickly figured out that one was from their youngest sister and that the drunk husband most likely did it, which turned out to be true. Apparently the middle sister had driven the youngest sister to hate her husband and start to cheat on him, and he confessed to killing them in a jealous rage and sending the ears to the cause of the problem.
Sherlock Rating: 4 magnifying glasses. It was interesting, but dragged on a little long.
Mystery Story Convention: Mistaken identity due to close (sibling) relation. Detectives/Police seem to frequently get on the wrong track just because of something as simple and common as having a sibling.