The film makes a home in your brain and the only cure is to see it again.

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 storyline feels a little thin and moth-eaten in parts but this sequel is plenty of fun.