Earth has been decimated by four waves of deadly attacks by aliens. First, the power goes off, sending humanity back to the Stone Age. Then, there's natural disasters such as Earthquakes and floods. Then, disease. Teenager Cassie (Chloe Grace Moretz) has survived with her father and younger brother. That is, until the camp they are staying at is visited by the Army. They explain that they are here to help and that they have a safe haven. But they want to bus the kids to their camp first, with the adults to follow. It's a scam, which Cassie soon discovers. Her father is killed and she's separated from her brother.
The kids are taken to an army base where it's explained that the aliens are now able to inhabit the bodies of humans. They've developed special goggles which can identify them-and that the only way they can help mankind is to become soldiers and kill the alien imposters. Of course, things aren't as they seem (which you can guess about an hour before the big revelation).
Although I really like the first twenty minutes, with the disaster special effects, this young adult novel adaptation pales in comparison with the DIVERGENT, HUNGER GAMES and PERCY JACKSON movies. It's predictable and boring. Definitely not recommended.