On the edge of the Antarctic circle, a steamship approaches a desolate island. On board is a young man, poised to take up the post of weather observer, to live in solitude far from civilization. But on shore he finds no trace of the man he has been sent to replace, just a deranged brute in the lighthouse who has witnessed a horror he refuses to name. For the next twelve months his entire world will consist of a deserted cabin, rocks, silence and the surrounding sea. Then night begins to fall...