Ripley and Zoe are survivors in a world burned to ashes by the spacefaring Dragoon Swarm. Together with an alien child they rescued, they fight tooth and claw to secure food and water, and evade the toxic fumes that begin to fill the sky.
There is a something tapping at the door; only a visitor, or something more? Whatever truths and terrors lie on the other side, Ellie must open it if she wants to know what haunts her mind.