On the edge of the Antarctic Circle, in the years after World War One, a steamship approaches a desolate island, far from all shipping lanes. On board is a young man on his way to assume the post of weather observer, to live in solitude for a year at the end of the earth. But on shore, he finds no trace of the man whom he has been sent to replace - instead just a deranged castaway who has witnessed a horror he refuses to name. The rest is woods, a deserted cabin, rocks, silence, and the surrounding sea. Then night begins to fall...