What is the 5th wave?

The much-anticipated movie adaptation of Rick Yancey’s novel, The 5th Wave, ¬†opens in cinemas around Australia TODAY. Just ICYMI, here’s the basic plotline: The 1st Wave took out half a million people. The 2nd Wave put that number to shame. The 3rd Wave lasted a little longer. Twelve weeks . . . Four billion dead. […]