Australian filmmaker Grant Sputore's direction keeps viewers on their toes, and we never quite know who to trust.

It's an exciting film to watch, but an even better one to think about after - preferably in the company of a real, physically present person.

It's rich material, handled brilliantly by first-time feature director Grant Sputore, a West Australian, working from an intelligently wrought screenplay from American Michael Lloyd-Green.

Rugaard has to be able to play the naiveté of a child while also underscoring the fact that this particular child has been uncommonly trained and is quite knowledgeable and resourceful. She handles it well...