The 5th Wave
     by Rick Yancy
First Wave: “Lights Out” During the first wave, the Others release
     an EMP wave that takes out all electronic technology and kills half a million people by shorting out all
     moving vehicles, including planes in
     mid-flight. 
Second wave: “Surf's Up” The
     Others, realizing that roughly 40 percent of Earth's population lives
     within 60 miles of the coastline, drop enormous rods "twice as tall as the Empire State
     Building and three times as
     heavy" onto the Earth's fault lines, causing massive tsunamis that
     wipe out three billion people. 
Third
     wave: “Pestilence” The Others launch a scheme to infect as
     many remaining survivors as possible with a deadly virus. Using the
     Earth's birds as carriers
     (via falling excrement), the plague claims 97 per cent of remaining
     survivors. The virus, which resembles an advanced form of Ebola, causes victims to slowly bleed to death
     until eventually "you've become a viral bomb. And when you explode,
     you blast everyone around you with the virus". 
Fourth wave: “Silencers” After the 3rd wave, the remaining human
     population tries desperately to survive off whatever resources remain by looting, all the
     while clinging to the hope that "the people in charge", wherever
     they may be, are working toward a solution. Eventually, this belief seems
     legitimate when an impressive battalion of
     soldiers (with functioning vehicles) arrives at the makeshift camp where
     Cassie, Sam, and her father are staying. The soldiers and commander,
     however, only appear interested in the children and promptly load them
     onto waiting buses before ordering all the adults into the camp barracks.
      Once the humans are surrounded, Commander Vosch orders a massacre
     and kills everyone at the camp.  Cassie, however, narrowly escapes
     and witnesses her father's death by Vosch's hand. At this moment, the 4th
     wave becomes clear: not all "humans" are actually humans.
Cassie goes
on a mission to rescue her little brother.  She finds herself trapped and
wounded by a sniper.  But eventually, he walks away.  A couple of
days later, she discovers another survivor, delirious, she faints and wakes up
in his farmhouse.  Her little brother and her fellow survivor are trained
in weapons and then sent on a raid to root out the Others.  Only it turns
out that their Sergeant is really an Other and the exercise is a trap to remove
the best defenders of humanity left alive.