The twins of anubis

Nina, Amber and Fabian walk back to Anubis house after school, they were talking about the writing on the wall and what made Sarah so afraid to mark down her days.
"I still don't know how we can find out more, I mean Sarah isn't exactly all there" we stop as I open the door to a third bed and a sleeping girl, before I can even say anything "Ashley you're back!" Amber cheers and Fabian runs over and engulfs the girl in a hug "you should have told me you were coming back!" I stand there shocked "umm hi there I'm Nina, and you are?" Amber says "this is Ashley, Fabians twin sister, she hasn't been here for a good few weeks as she was in hospital as she has a chronic condition and about a week before you came and Joy disappeared she had a major flair up at the top of the stairs and fell down them" and that's how I met the 'twins of Anubis' as everyone calls them

This starts from house of intruders/ house of proof as somehow I though that would be a place to start.
for context because Ashley nose dived down the stairs her parents said they may take her out of the school hence the no bed until they come back from school because her parents decided against the idea and it was easier putting a third bed in the first room.