With a lot of branches and a lot of secrets ... and a lot of timelines too. You may wonder from time to time or start the guessing game (as to where this is heading), but it will still have surprises along the way. It will also have nudity and violence on full display.
So if any of this is offensive to you - you might want to stear clear from this. Certain things have to happen and the going back and forth (no pun intended) serves the story well. The acting is good and if you are into mystery you will cherish what this tries and achieves to do. Solid as a rock and another example of a good thriller coming from Spain