The film was shot on location in Glasgow and the Scottish Highlands.

Scarlett Johansson plays an alien predator. She wears a black wig and is not immediately recognizable as she cruises through Glasgow and the surrounding countryside picking up hitchhikers in a van equipped with hidden video cameras. Like candid camera, their reactions are real and authentic. Their stories offer a glimpse of society from the point of view of the ultimate outsider. 

Adapted from the book by Michel Faber