The Unreliability of the Ghost Story

I think there's actually like a book, I think there's a Sherlock Holmes story where he investigates this. The implication from the frame narrative is the guy Douglas knew this woman and she had written this all down in a manuscript and given it to him. And that's all you hear about it. Like there's no follow up on what happened to this woman, to this governess because she doesn't die. Is she committed to an asylum? I don't know. Who knows?