by JeanPanty
Hope the author is not building a nuanced, likable character in Kaitlyn just to kill her off in pursuit of an emotional bear trap.
My immediate thought is that Kaitlyn is the killer and the previous killings were done as a cover for her brother's. A common thread in many serial killer stories is the investigators concentrating on finding a serial killer and not looking at whether there's someone who has a reason to kill one of the victims in particular.