Some movies have big spoilers in their own titles, basic plots or trailers. There, you have clues of what production team want you to know. I'll try not to go further.
We are introduced in the very beginning (by journalists' fragmented threads on voice-over) to Anna Fritz persona and we are get to know that she is a worshiped celebrity. Her death is where it all begins.
Then we are taken to the point of view of three curious guys that want to see her for the first and last time. What I can say it's not a good idea.
This movie have some violent scenes. If you are more or less sensible to 'moral terror', despite the comments of the toughest viewers, I think you will suffer.
From one specific moment, the story they are about to tell us, could perfectly fit in horror genre, but it clearly follows the way to a claustrophobic crime flick.
The cast is good, especially for the pretty Alba Ribas who plays Anna Fritz (in some shots she looks a little like Chloë Sevigny). The characters are made for the plot, so don't expect a great character developing (runtime being 76', it's not possible in an action centered movie). The pace is fast, and it works. No place for being bored. Give it a chance!
So from now on, it seems we have more reasons to be afraid of dying!