I can't really say any more except that from this point the the story changes more than once, switching genres faster than we can keep track--comedy, romance, drama, thriller. But even that is misleading, because these shifts take place within the characters, as these two people (and a third interloper played by Robeck) continually reinvent themselves as unexpected heroes or villains. Or both. Preston's screenplay is ingenious, drawing on British classics like Cul-de-Sac and The Servant to constantly undermine audience expectations with subtle changes in the balance of power. Blake is terrific as a strong woman forced to draw on untapped inner reserves. It's a tour-de-force performance that throws us around like rag dolls as we root for her, then against her, then fear for her sanity, and more. Meanwhile, Neill is terrific as a sexy, enigmatic stranger who's also a bundle of revelations and contradictions. There are segments of this film that are so black they're almost unwatchable--seriously twisted stuff that blurs dreamy beauty with psychotic horror. Some of this is just plain grisly, while other scenes are soaked in emotional resonance. And while the plot is more than a little bit loopy, it also brilliantly straddles the fine line between sanity and madness.