There is something very strange; witnesses sighted her at the Downs with her birth Dad, so that is where they searched and found her body.
But according to the police, Kiri was separated from her birth father, and got a bus home, so how did her body then get back to the Downs? And is that a coincidence that her body was found where she was seen with Nathaniel?
Si and his mother have a very odd dynamic and relationship - I wonder if he is abusing her. I also wondered if he had aspergers syndrome - some of the conversation was reminiscent of teens I know with ASD.
I think we will learn more about the father in episode 4.