Annihilation - Book 4 - Megan DeVos

For Hayden and Grace, the threat of war has become a reality. The world is running out of resources, driving the survivors to drastic, inhuman measures. Blackwing is the obvious target and physical attacks from enemies are accompanied by the devastating mental turmoil that cannot be fought off with weapons.

This is life impacted by war with enemies, allies and oneself. Now, not much is certain, but a few things are guaranteed:

There will be pain. There will be death. There will be annihilation.