The way you describe it, reminds me of The disappearence of Alice Creed. Generic name, generic plot blurb. But when it says on the blurb that it will keep you guessing with plot turns consistently...it really wasn't lying. It felt like a new genre of thriller had been invented. Where it purposefully places the viewer in a constant state of unease, distrust and surprise. Subverting expectations so much that you just stop attempting to find cliches and enjoy what is there. If this movie is even a tiny smidgen bit like that, then I must see it to affirm that this is indeed a brilliant sub-genre of thriller that was not dreamt up in kookie-land.