There's only 4 episodes left on Harper's Island and it seems like we still have no clues as to who the killer could be. It's obviously none of the people that are already dead. So which of the remaining 16 people could be the killer?
My best bet is Henry. He has the perfect reason to do it.
He wants to get back at Abby.
Henry and JD's parents died in an explosion. What if it was the same explosion that Wakefield was accused of? Wakefield intended to kill the sheriff in that explosion because the sheriff was with Abby's mom, but he didn't die. But many other people did die - Henry's parents included.
So now Henry wants out to Abby.
Ofcourse, there's no way he could do it himself. He needs help. So I think he;s most likely getting help from Maggie and /Nikkie. And he's gonna make Abby's father look like the killer and make him commit suicide.
This is the most reasonable solution I've come to. What do you think?