Instead, you get a movie that's enjoyable enough, but leaves you feeling like it could have been much, much more.

This is a must-see and one of the best documentaries - and films - of this year.

It's funny, it's tense, it features two great performances from two actors and the director expertly creates a web of odd tension where you actually don't know what is happening for the majority of the run time.

This film is so real. It treats its characters with so much care and sensitivity.