This came into my head, and may not even make much sense. I had a tune to go with it, but it's hard to express that in writing.
Knock knock knocking on the court house door
The story's all been told before
Sherlock Holmes has caught his man
Brought to the court so he can hang
At the place the crime was done
Deductions now at three two one
"Dirt on shoes from down the road,
Come on now, does no one know?
They mean we have caught our man.
Bring him to the court so he can hang."
The story's all been told before,
To the knock knock knocking on the courthouse door.