The last story was an ode to those old detective novels which I'd stopped reading years ago because I disliked having to strategise while reading for fun. However, the mystery was easy enough that I'd inadvertently discovered the answer rather early on. It was the details that tripped me up. Also, the solution to Tsuruya's third story left me cold. Based on how I remember Japanese being spoken, the answer did not compute for me. Perhaps, it's because of how my dialect of English is spoken. So I didn't catch whatever word play was supposed to be going on.