The people of Earth know that the Celestials are a threat, but they do not know when they will strike. Jace and his team, which includes Union men, need intel on how to kill the beasts. The group opens up Earth's slip tunnel again to explore their last known position. After raiding an abandoned Celestial ship, the group decides to explore a Celestial planet similar to Titan. Their scans show no life signs, but with the Celestial technology, the data could be misleading.
This book was like a rollercoaster. You slowly go uphill for an exaggerated amount of time until you are lulled into a false sense of security when it reaches the top. At the height of anticipation, you come screaming down the other side holding on for dear life thinking "No, no, make it stop!" This one shook me up a bit.