Its unpretentious plot makes for a diverting if inconsequential couple of hours.

There are only so many ways you can film two actors in a single location, whatever the supposed altitude. But Frank maintains suspense with enough success to vindicate his reliance on old-school, non-digital techniques.

While the pace falters a little – there are only so many ways you can almost fall off a tower, after all – the tension is unrelenting.

Fall is undeniably effective when it comes to thrills, despite a derivative script underserves its characters.