The Aeronaut's Windlass #1

Since time immemorial, humanity has lived inside the Spires, warring habitats towering for miles over the dangerous, monster-infested surface of the world. Captain Grimm of the airship, Predator, was dismissed from Spire Albion's military in disgrace - now his ship and crew are all he has, and he's fiercely loyal to both. When the Predator is damaged in combat, Grimm is offered a choice - take on a clandestine mission for Albion's leaders, or stay grounded for good.

But he will learn that the conflict between the Spires is merely a premonition of things to come. Humanity's ancient enemy, silent for more than ten thousand years, has begun to stir. And death will follow in its wake...