Four high school students are being driven back from a wilderness camp in the White Mountains of New Hampshire when their teacher takes a detour. He claims he just wants to take a look at the private school where he started his teaching career, but then he heads into the deserted and remote mansion and promptly disappears. The four students find themselves stranded as a snowstorm moves in, but they become increasingly aware that they're not quite alone, and that the ghosts of this place might be the least of their problems...