Years have passed since hostile creatures flew down from the sky and forced humanity to fight or flee. Now, the surviving humans live in underwater cocoons, knowing that the world above does not belong to them anymore.

Marla Hightower is just getting by with a job she loathes in a cocoon, longing for something more fulfilling after a rough start to life. But things change as she begins to develop unusual abilities not unlike the winged creatures who invaded her world.

Knowing that being discovered will result in her being experimented on and placed in confinement, Marla plans to escape from the cocoon and launch up to the surface, beginning her dangerous journey to uncover not only her origins, but those of humanity's enemies.