Iva is a teenage Calypsian, an alien living on one of Saturn's moons. She enjoys her sheltered life and feels safe knowing her home's atmosphere is designed to protect them from enemies. But when Calypso is suddenly invaded by humans, she finds herself face to face with Justin, a 17 year old boy from earth. Stuck in the middle of a war zone, Justin and Iva have no choice but to put trust in each other in order to put a stop to what's going on, and save their own worlds.