Quote:
Originally Posted by UsagiTenpura
Edit: Heh even simpler without even a murder.
Ensure that a room is empty and that there's only one way to leave it.
Witness Shannon entering it and that none others enters it.
Witness that Kanon leaves it and none others.
Enter the room and find it completely empty.
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Yeah, although that's just a little
too obvious. It's possible to use that as the core of the solution and construct misdirection around it though. That's kind of the problem with the existing puzzles in the story: None of them really require this at the core. It could be either Shannon or Kanon doing this or that and it largely doesn't matter who it is, particularly when somebody's going to turn up dead anyway (it's not like they can tell anybody).
EDIT: Actually why didn't I think of that? The victim leaves behind some kind of clue as to their killer, pointing at Shannon as the killer, but Shannon couldn't possibly have committed the murder for whatever alibi reason. Kanon, however, could have, but it's dismissed because the victim didn't incriminate Kanon.