If you’re looking for a bug hunt, you should probably head over to the aisle with Alien vs Predators or Aliens or somesuch. Gareth Edwards’ Monsters is not about the critters from outer space, but our reaction to them.

The scenario is this: a NASA probe carrying alien life from somewhere in our solor system has burnt up in the atmosphere, but consequently, strange creatures have appeared in Central America, to such an extent that much of that region has been declared a quarantine/infected zone. The creatures have a seasonal migration during which things get particularly hairy for those caught in the zone. In this case, there’s a photographer, Kaulder (Scoot McNairy), and Samantha (Whitney Able), the daughter of his media mogul boss. Kaulder, who would rather be chasing fame and fortune with his camera as the creatures hit the road, is instead saddled with babysitting duty — daddy wants his daughter shipped out on the first available ferry to the USA, where her fiance is waiting.

Naturally, the travel plans are somewhat interrupted, and the two get to reveal certain truths about their personalities and lives.

There’s no real big picture to the alien encounter, and I don’t want to give away much about the nature of the critters, but this is a very localised story — the opening titles annoy with mention of ‘half the country’ without saying which country (we presume America, the movie is set in Mexico); there’s no mention of how the rest of the world is faring, or even why Sam has to leave by ferry rather than say, by air, or by going to a different country south of the zone. Maybe I was dense and missed the salient details. Certainly, at movie’s end, I wished I’d paid more attention to the opening scenes; now I really want to see those again, just to confirm some things.

The thing is, this IS a very personal movie. It’s about the two Yanks and the place they’re in, about how the politicians have responded to the arrival of the alien lifeforms — America, for instance, takes its Mexican border fence a massive step further and builds a modern Great Wall — and how this varies to the response of the people still living within the quarantine zone who are dealing with this change in their natural environment while the jets rain down bombs and chemicals and the tanks rumble through the streets.

Monsters is elegant and understated and beautifully acted, the dialogue so natural in fact I wouldn’t be surprised if some was simply ad libbed. The relationship between Kaulder and Sam unfolds at such an unforced pace, it’s a delight.

The director knows when to use handheld and when not to and the use of the aliens is wonderfully controlled to deliver moments of tension and of wonder. Not a bad effort for a low-budget flick! (IMDB says the estimated budget was a mere $200,000. Amazing.)

There are some clever Jurassic Park/War of the Worlds moments to add tension and action, but it’s the very believable portrayal of two ordinary people, and indeed a nation of ignored people, under stress that makes this movie one of the year’s best, and certainly a sterling addition — following on from District 9‘s alien-as-refugee scenario last year — to the canon of alien invasion movies.