Martians invade the earth. But instead of arriving in overcompensating spaceships, they just "kwimmed" to earth, meaning, just arrived- like that.
But instead of being blood thirsty aliens annihilating humans, they just annoy humans by invading their privacy and making their every secret public.
Well, the plot sounds good and funny, but this was bit of a letdown. Apart from being dated and trashy, there were very few funny moments than what I had expected prior to reading this.
But on a plus side, in some areas - like the effects on global economy for example - Brown has clearly put some extra effort and thinking, especially considering the expectations one might have had looking at the book cover and the title of the novel.