I thought it was a tad strange that both their children had been murdered and that they were sitting down to a cooked dinner - don't think most people would even be functioning.....
I don't think it was mentioned who she is although I wouldn't be surprised if she has some kind of connection, the nurse was nervously fiddling with the jewellery (I thought it was a spider brooch) in the house, as if drawing our attention to it.
Just caught up with this. Really good. I think that the couple think that it was their son who did it. As it seems something has happened in his past. Don't think the druggie did it - but he recognised the bride in the photo I think. Too many thinks, methinks!