Lots of good theories on here... but I still think much of what I thought from my last post, a week or so ago.
I think Iraq will be unconnected to Alice / Sophie except for Drilla. I don't think the 13 year old Iraqi will have any further connection, and I don't think Reed or Stone was directly involved in this case.
I do think Sophie and Alice were groomed, and tattooing themselves was part of that grooming. I also wonder if Alice was taken to be a friend for Sophie...?
I don't think Reed knew about Sophie until she got appendicitis. I think Drilla called him in to help and threatened to speak out, so was killed, framed to look like a suicide. Drilla was planning to use Iraq (and possibly his prostitution habit, if he knew about that) to silence him. He wouldn't agree to keep silent, so was killed.
I also think Stone has no direct involvement with the Sophie case. I think when Sophie said "how can you live with yourself" she was referring to Iraq and only knew about that because of Drilla. But it could have been some kind of warning to him to back off....
I do think it will turn out that Drilla swapped the DNA samples.... okay, so people have said it wouldn't work out in reality - but this is a tv show, and they're not always an accurate portrayal of reality.
I'm still convinced Lucy is Sophie's daughter. I also think Sophie hates Drilla but is biding her time to get Lucy away.
Things still left unresolved...
The relevance of Lena
Quite why Stone warned Sophie to remain silence.
And the big one no one seems to have mentioned yet - the symbolism of the wolf.
I noticed it on the clues someone posted in the last couple of days. But it was also on Sophie's clothes after she returned, it was on the theme park photo and it was on the banner / flag when they were in Iraq. What is the significance here...?