While it doesn't offer any answers, it both thrills and makes you think.

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.

Blistering performances.