Ne te retourne pas

And to not give things away, you're not sure whether there's a psychological thriller or some odd crime-horror thing going on until near the end. Fortunately, it does stay consistent with the story it tells, so the ending isn't illogical or a surprise simply for the sake of surprise.

As is becoming more common recently, you're dropped into the story from the character's point of view with no setup and only minimal context, seeing the world almost completely through her eyes.

It also brings in some interesting facial/body visual FX morphing to help tell the story, so fans of the main actresses get their wish in seeing what they might look like if combined.

There are a few annoying plot inconsistencies and story development limitations, but if you ever wondered what a chick-flick thriller might be like, you now have an answer.