Four waves of increasingly deadly alien attacks have left most of Earth in ruin. Cassie is on the run, desperately trying to save her younger brother.Four waves of increasingly deadly alien attacks have left most of Earth in ruin. Cassie is on the run, desperately trying to save her younger brother.Four waves of increasingly deadly alien attacks have left most of Earth in ruin. Cassie is on the run, desperately trying to save her younger brother.
