But is the virus really contained? Obviously not, and Fresnadillo nicely captures the panic of a US force hardly anticipating such a crisis, declaring a “Code Red” and resorting to firebombing London (London!!!), irrespective of who may be torched alive.

The violence is relentless, with Fresnadillo making it clear that he isn't making films for the faint hearted. However, there are many nice moments, including a night sequence and another where the play of light on victims’ eyes makes it difficult to tell the infected apart from the normal. The idea to put Don and Sally’s two children at the centre of the story is also inspired.

But as he does suggest a sequel, in France, one piece of advice: London may have agreed to the depiction of an assault on its soil as an entirely American problem (everyone from the Chief Medical Officer to the sniper with a heart of gold tackling the virus is an American), Paris won’t be as malleable.