This novel was outstanding. It is not predictable, as are many sci-fi novels. Aliens come to earth, but they are not like what we have imagined in the movies. They came not only to conquer us but also to annihilate us. They came in 5 waves, hence the book title.
Wave 1: turn off all electricity, machines, wipe out 500,000 people
Wave 2: cause earthquakes, wipe out 3 billion people
Wave 3: disease and pestilence , wipe out 97% of the survivors
The bulk of the novel is Waves 4 & 5. It involves trying to know who the enemy really is and what does he want!?? And how to survive. Great book!