Edge of the Knife (2018)

In a 19th-century summer, two large families gather for their annual fishing retreat on the far-removed island of Haida Gwaii. Adiits'ii, a charming nobleman, accidentally causes the death of his best friend Kwa's son and hastens into the wilderness. Adiits'ii is tormented by what he has done and spirals into insanity, becoming Gaagiixid, a supernatural being crazed by hunger. He unexpectedly survives the winter, and at next year's gathering, the families try to convert Gaagiixid back to Adiitst'ii.