Oh dear I seem to have come a bit late today. Please forgive me. ;-;
With that said, it seems we don't have much to go on. We know one person is innocent, that the mafia probably knows who Grendle is, and that we can ask the Mirror a question if we format it properly. We also know another thing: the mafia got two townies last night. The opening post mentions Georgie went out of his way to kill the Woodsman, which likely means he used his ability, and the other kill was probably a normal kill made by the mafia. We also know the mafia seem to have unlisted powers, and somebody has the ability to leave messages.
Moving on to asking the Mirror a question... I'm not entirely sure just outright asking it who the Crooked Man is is going to work. It seems too easy, we have a character that is mafia and is linked to mirrors, and we can only ask it a question every other day so if this doesn't work we have to wait two days to use it again. On the other hand though, we need to figure out how the Mirror actually works, and while we might not get an answer as to who the Crooked Man is, we'll definitely get feedback of some sort giving us an idea as to how it functions and what we can ask it next time. We need to figure out how to use it, and we might as well figure that out now as opposed to waiting until later. So with that, I'll vote and contribute my efforts.
[Arrest] No one
Magic Mirror, I'm your biggest fan;
Tell me, who is the Crooked Man?
(and also if he is a Sonic fan
and has worms in his brain pan?)