Lack of good storyline.

Tells a fascinating and unsettling true story, and does so well, without pretending to have all the answers.

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.

The joyful confection is coated in a sparkly gloss, bright enough to gleam from the darkest, most cynical corners.