[Tom4784]

I've got a theory, there's more then one killer. I rewatched all four episodes with my sister and since nearly all the characters are in a group most of the time there must be 2 or so killers. I'm not sure if Cal (English dude) or Chloe (serial killer lover) are the killers because in one of the credit sequences you see them running away from someone. Unless one of them is acting.

I'm starting to think it's not Henry either, I just can't think of a motive. The only way it'll be him is if they really wanna put a twist in at the end and make hism otive some obscure reason.