For some reason I am totally unable to post to the "two more haunts needed" thread, so I will give it a try here. (I note that no one has ever managed to respond on that thread--maybe it's not just me?)
One source of additional haunts would be the dead children. We see them from their mothers' POV but we don't ever get their POV. Some ideas: toys coming alive, the death or death and reanimation of a beloved pet, a child eavesdropping on his parents and hearing something awful, monsters under the bed, an imaginary friend. The attic whisperer in RotRL #1 might provide some inspiration if you haven't used it previously.
Another possibility is that Iyesha's Varisian kin returned at some point looking for her and came to a bad end; you could do haunts related to them. A harrow-reader tearing her own eyes out, someone hacking off a part of his body to get rid of fungus infestation, that sort of thing.
Mary
Thanks Mary,
I had been thinking of maybe using the carpenter, but I like the children idea.