It basically follows the events of an alien infected zone between the United States and Mexico following the crash of a space probe in the region.
The infection has produced creatures of War Of The Worlds proportions that have a bit of Alien mixed in.
A photographer escorts a US tourist through the infected zone from Mexico to the apparent safety of the U.S.
The United States is protected from the infected zone by a giant man made wall that invoked memories of President Trump's Prexidential campaign in 2016!
Chuck in a bit of Jurassic Park, 28 Days Later then you are halfway to understanding this film.
It obviously had budgetary constraints but Edwards proves his credentials for bigger projects in future with this effort that looks more polished.
SPOILER: the movie is about what Monsters humans are, and how beautiful the aliens supposedly are, which doesn't work because most of the humans in the film go way above and beyond to help each other out and show what beautiful creatures humans can be. The entire film doesn't make any sense whatsoever. If the director didn't have his head shoved so far up his ass he'd have shown just how disgusting humans are throughout the whole film before the grossly disappointing ending. If I'd seen this in theaters I'd have asked for my money back, and I've never done that in my life. The only "Monsters" are the goddamned marketing team here.
These pretentious indie films cocking off with the attitude that "oh you're just too stupid to get it" need to end.