Part Two of a four-part series! Earth’s alien-born heroine Aurora Palmer has disappeared during her mission to explore a mysterious object on a collision course with Earth. Back on Earth, Scott studies the broken remnants of the Brut’hara, looking for a way to communicate with Aurora. Meanwhile, Kristine and Gus watch helplessly from Vanguard, unaware that Aurora is alive and exploring with old friends the massive interior of the ancient structure.