Simple and well acted, it has tension enough to knot the stomach.

It is not deep, but it is fun to watch. It does have a bit more of an edge to it than other similar films.

If the ambition is to provide two hours of instantly forgettable, popcorn-munching escapism, it succeeds.

A film of deceptively outspoken contemporary relevance, this is cinema at its most alert, alarming and alive.