My take was that the "person" seen at the top of the lighthouse was Angus' ghost.
Patrick was real, pretending to be Angus to Rachel, whilst never showing himself around town. He, Sharon, and Brian plotted against Rachel to get her money after passing off her murder as a suicide, which no one was supposed to question, since she'd been all over town talking about having seen the dead Angus (crazy) and also in mourning over the death of her son.
Sharon mentioned seeing Patrick at the top, and asked why he ad-libbed by being up there, but he told her he wasn't. She'd actually seen the real ghost of Angus. Patrick gets accosted by something which I assume to be the ghost, at which point perhaps he was possessed. It seemed to me the ghost of Angus, perhaps in Patrick's body, killed Brian, which was a re-enactment of what he'd done in life when he discovered his own betrayal.
Patrick, sans Angus, committed suicide after becoming guilt-ridden about what he did to Rachel because he realized he loved her after all. He knew there was no future for them after what he had done, and that he'd be jailed again, which he said earlier he could not face, so he took the plunge.
I felt the twist was that while Brian and Sharon were trying to make Rachel seem crazy by hiring Patrick to pretend to be Angus' ghost, Angus' ghost really was there as well, and killed Brian, instead of Rachel dying at their hands.
Hope this makes sense!
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