Old Bonegrinder Windmill

What we know

Dilapidated windmill on west fork off road approaching Vallaki (Session 8 @ 01:14:46)
Morgantha lives there with daughters Bella and Offalia (Session 8 @ 01:19:48)
Party passed fork without entering; Morgantha returned up road to mill (Session 8 @ 01:25:25)
~two hours from Vallaki; night hag (Morgantha) occupies site per Stella (Session 19 @ 01:11:55)
Hag heartstone likely inside; covens of three possible (Session 19 @ 01:17:27)
Module name Old Bone Grinder per DM (Session 20 @ 04:04:42)
Ground floor makeshift kitchen; filthy; barrel stench; brick oven; crumbling stairs (Session 20 @ 01:36:47)
2nd floor: millstone with locked compartment—held coven contract (Session 20 @ 01:45:24)
3rd floor: gearshaft chamber; two young hags; child whimpering in closet (Session 20 @ 01:49:08)
Night-hag coven defeated here Session 20 (Session 20 @ 04:04:42)
Heartstone looted from Morgantha's neck pouch Session 21 (Session 21 @ 00:15:23)
Fyodor and Myrtle rescued from 3rd-floor locked crate (Session 21 @ 00:20:49)

Morgantha pointed to mill as her home during pastry encounter (Session 8 @ 01:19:48)