The paradoxes of time travel stories are always fun to absorb, but Timecrimes focuses more on the paradox, and less on the story. In a Rear Window fashion, a character sees a crime, but later discovers the crime happened after a present day character returned back in time. So how/why was that crime "placed" in that time in the first place? Hard to explain. You'll enjoy this movie during its hour and half length (especially while you discover the reasons for the characters' apparently unrealistic actions), but at the end, I preferred not to struggle anymore with the confusing elements.