What makes the film work as well as it does, at least up to a point, are the perfectly calibrated performances. Folkins is superb as the socially maladroit Andy, making his character sympathetic in his genuine satisfaction in being a caretaker despite the personal toll it enacts. And Wheaton, whose entire performance consists of sitting in a chair and talking directly to the camera, uses his innate likeability to at first disarming and then chillingly creepy effect.