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.

It is an exhilarating, distressing, funny and profound film, with one of the more memorable film scores in years,

Story: It's very simple but honestly that is fine.