What should have been a seemingly insignificant event has angered the Spirits, and now, a mysterious threat is consuming entire stations that Loki built for a population of humans near the center of the galaxy. With no clear understanding of the cause, Loki has returned to Survey seeking help for his people. But can Jack, Marsha, and teenager Po carry the weight of saving an entire civilization? As they grapple with the enormity of the task at hand, the stakes rise higher than ever before, threatening to break them all.