A Lighthouse

It is 1800. A lighthouse on a barren cliff in Canada. Two lighthouse keepers, German immigrants, are alone for the winter and effectively cut off from the rest of the world until the ice thaws. Both Wilhelm and Matthias are settled in for the long haul with warm clothes, food, and matches a-plenty. Then Wilhelm starts hearing voices. His personal belongings disappear from where he'd placed them, only to reappear in strange spots—like the catwalk, or dangling beneath the spiral stair knotted in brown twine. Matthias begs innocence. Little by little, Wilhelm grows convinced that Matthias is trying to convince him (Wilhelm) to kill himself. Is the insanity real, or is this really Matthias' doing? And if it is real, what will he do to defend himself? There are so many months until spring… (Bonus: this prompt works from Matthias' point of view, too, since he'd find himself locked in a lighthouse with a crazy guy.)