From Young to Old

Exploration Stage: Secret Room
From: Detective
Description: The Shadow mentioned in his letter that he needs the souls of maniacs to fulfill a prophecy. But who was the second "famous" killer he summoned? A huge marionette just fell into the fireplace and burned down to the... bones. Like a living being. Find these bones, buddy.
Completed: Wow, these bones were clearly used for black magic! And they are all so small... as if from a child! What awful maniac could have done this?