Laurie Metcalf, Tatiana Maslany and Paul Sparks star in Levi Holloway's new thriller.
When a couple crashes their car in the mountains, they seek shelter in an isolated cabin. Its inhabitants, though somewhat unusual, are eager to make their guests feel right at home. But as the blizzard outside rages on and one night turns into several, the couple becomes less and less sure of what's true—about their hosts, themselves, and why that sound in the walls keeps getting louder.