Inspector Zhang and the Dead Thai Gangster - Stephen Leather Pleasing little locked-room (plane) mystery. How could the man by the window have been shot during the flight in front of all the witnesses when he was alive when the flight left?

...once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.” Sergeant Lee frowned. “But how does that help us if everything is impossible?” “No, Sergeant. Everything cannot be impossible, because we have a victim and we have a crime scene and we also have a murderer that we have yet to identify. What we have to do is to eliminate the impossible, and that we have done. We know that he was killed on the plane. That is certain because he was alive for most of the flight. So it was impossible for him to have been killed before boarding. But we are equally certain that it was impossible for him to have been shot...

A good introduction to the longer novels. Fun and cheap for the Kindle.