Caught in the middle of an intergalactic war, Earth is conquered in a matter of hours by an alien species with no concept of family, culture, humor, or art-- or hope. In the face of superior alien technology capable of cutting holes in stone and metal without explosives, and overcoming the most basic forces of gravity, the human race is forcibly resettled into densely-packed communities in Australia while this invading race occupies every other continent but the frozen Antartica.
Before long, the war that chased this alien race to Earth catches up to them. The conquering Boov flee their enemies, leaving humans to stand alone against the destructive forces of the Gorg, who are determined to destroy the planet.
Sound like my next NaNo? It's not, actually. My daughter is currently obsessed with the movie Home, a feel-good story of a little girl who makes friends with an outcast Boov named "Oh." It has a happy ending with dancing and music, and every time she puts it on, I'm inspired to write a sci-if horror novel.