Stabbing mystery from Detective Conan

[tornadoz01 0]

So I have a play set in medieval times where a crime occurs. The killer is the king's uncle, the victim is the king's maid, and the detective who deciphers the clues is a knight. 

Now, due to the killer's high status, the knight needs absolute proof that the crime was committed by him. I need a subtle way for the advisor to have committed the crime and a way for the knight to find out that he was the killer.

...plus, the victim was stabbed.

Any ideas?

[Chekhov MacGuffin 1089]

This is the wrong subforum for this topic. Maybe try the chatroom or the fanfiction area?