There are hints all over the damned place. Look back through your notes for a file that sounds something like "The Kidnaper was charged guilty and hanged, the thief was charaged guilty and hanged, etc etc." Now, there's a corresponding room to the "noose room" with a bunch of stuffed dolls. Each one has a note pinned on him like "the thief" or "the kidnaper". You need to figure out which criminal was actually inncoent by comparing your notes with the dolls in the room. Once you've figured out which guy was innocent, you need to return to the "noose room" and pull the corresponding noose. Got it?