I've been watching a lot of sci-fi lately... there are plenty of creepy concepts out there among the sci-fi genre, and I've definitely borrowed one here.
Eileen invited herself into the story one day and decided to make herself comfortable in her Spinner's End house. *g* I've always loved her and loved reading fics with her in it, so I'm really glad I got to incorporate her into this story. She's now become one of my favorite HP characters.