"I've heard stranger."

"No, it's nothing."

"Are you sure? This house strikes me as if it holds some secret." Honestly it seems like an extremely boring house but maybe she knows something Anemone doesn't.

The maid shakes her head. "The only secrets in this house are the secrets of how it keeps getting so many water stains when nothing leaks."

Anemone begins to elaborate on how the house seems Very Mysterious. Like it's singing to them, if only they had the information necessary to understand what it's trying to say.

Eventually, the maid says: "well... the thing is... maybe it's easier if I just show you."

She takes them to a water stain that looks, well, exactly like a mouth.

"Well. Hello, there."

"Uncanny."

"These form all over the house all the time," the maid says. "We have to clean them constantly."

"With the, uh. Teeth."

Ghosts. 

This is a known sign of ghosts.

Teeth things.

Anemone takes out her journal and makes a drawing of the teeth thing. Which is definitely a sign of ghosts. Can't believe she didn't think there were any ghosts here.

"These have continued to form the whole time you've been working here?"

"Yes."

It's ghosts. There are still ghosts here.

It Is Not Ghosts Oh My God Why Would It Be Ghosts Why Do You Think It Is Ghosts.

It's absolutely ghosts.

"Is there anything else unusual about them? Difficulty to clean, colors other than this, so on?"

"Other than being shaped like mouths, they aren't unusual for a water stain. To get them out I use vinegar and baking soda. Works like a charm."

A charm... for warding off ghosts!

Obviously the ghosts haven't been warded off very successfully.

Mordred is at least convinced that something really weird is happening, and it's not just that Mrs. Winston-Rogers is a deeply dramatic and vague person, so that's nice?

They thank the maid and leave.

"The ghosts are obviously still there. Water stains shaped like teeth seem like a definite sign of an ongoing haunting."

"Huh, I thought it might just be some sort of... ghostly residue. What do you think they could want?"

"That's the curious thing, I'm not sure. But whatever they wanted, it seems the death of Mr. Winston wasn't enough for them."

"Maybe after they got him, they developed a taste for it."

"I don't know. I wouldn't say he sounds like a random innocent victim in all this. I want to know more about what happened in 1924."

"I bet that Douglas guy knows more. We should check and see if the letters have any toothy waterstains or something."