I still think Piper is the main killer, but I'm so confused about the helper
At first I thought it was Jake, because the off-screen attack that wounded him seems so obviously staged.
But now I'm starting to suspect Audrey. It's so convenient that she and Piper are making Kieran look suspicous
at the exact same time. As if Audrey discovered the footage of Nina and Kieran, and told Piper about it, who then
came up with this random "oh hey I found Brandon James's mom"-plan. That woman could have been anyone.
Then Audrey's motive has to be related to her love for Emma? They did address that at some point.
And there are still so many suspicious things about her: the drama with the SD card; her DNA on the mask...
And I'm sure they probably can come up with a reason for killing her girlfriend Rachael
But I don't think 2 female killers would be able to pull off everything that has happened so far.
Especially now that they seem to have broken Seth/Mr Brandson out of prison...
Jake could have done that, but he was at the Halloween party with that girl, so it seems unlikely.
Brandon James still being alive, and working as a 3rd killer might explain that
But I'm honestly not here for that theory
Also; thank you cypriotpcdfan for spoiling the plot of Harper's Island on page 51

I was about to watch it after reading about it occasionally in this thread
(Sorry for the long post, bye

)