The Illuminae Files 3. Obsidio

Kady, Ezra, Hanna, and Nik escaped with their lives from the attacks on Heimdall station and now find themselves crammed with 2,000 refugees on the container ship, Mao. Kady's cousin, Asha, survived the initial BeiTech assault and has joined Kerenza's ragtag underground resistance. With time running out, a final battle will be waged on land and in space, heros will fall, and hearts will be broken.