Based on the best-selling novel, The 5th Wave, four waves of increasingly deadly attacks have left most of Earth decimated. Against a backdrop of fear and distrust, Cassie (Chloë Grace Moretz) is on the run, desperately trying to save her younger brother. As she prepares for the inevitable and lethal 5th wave, Cassie teams up with a young man who may become her final hope – if she can only trust him.