Although it has its amusing moments, in eneral the plot does not convince.

As somebody who had not heard any of this before, it became a curious phenomenon to sit and watch a film and slowly have the realities begin to click into place.

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's easily one of the freshest, sharpest and most enjoyable films of this year.