For Sara Long, every day aboard the deep-sea vessel Lewis feels like another step further from home. Tasked with scanning the Mariana Trench, she expects routine tedium—until her sonar reveals a colossal, city-sized object buried in the ocean’s depths. It’s not from Earth, and Sara’s discovery doesn’t just awaken her sense of purpose; it awakens the object—and the 22,000 beings inside it.
Their mission? Seed the first human life on Earth. Their failure? A catastrophe beyond comprehension. Now awake and realizing their plan has gone terribly awry, they threaten a war humanity cannot hope to survive.
As Sara races to contain the fallout, she faces impossible choices in a fight to save humanity from destruction—and herself from the ghosts she thought she left behind.
