An aptly named chimney climb that doesn't get wider than about 18" for most of its length. Scramble up a few blocks and place the last of your pro for awhile before pulling into the very claustrophic chimney. If you wind up facing the wrong direction it's going to be a challenge to turn around. Friction your way up the smooth sides until you can stand up in an alcove. Plug some gear in the cracks and climb the right wall of the alcove on jugs to a tricky topout.
An old guidebook calls this the best chimney in Pawtuckaway.
Uphill and left of the Exorcist, follow the trail up to the first tunnel and this chimney is on your right. To get back down, walk up and left then back down the trail through the tunnels.