When 13 year-old Penelope Gilbert accidentally transforms into a stapler during math class, she’s sure she's going crazy. But she’s not imagining the men in black suits now patrolling the halls at school, nor is she imagining the new substitute teacher who orders the class to take a special new test. A test that requires blood.

Hunted for her powers, and torn from the life she knows, Penny is swept up into a world in the clouds where magic meets machine and pirates rule the sky.

Jim Butcher, the #1 New York Times bestselling author of The Dresden Files and the Codex Alera novels, conjures up a new series set in a fantastic world of noble families, steam-powered technology, and magic-wielding warriors.

Since time immemorial, the Spires have sheltered humanity, towering for miles over the mist-shrouded surface of the world. Within their halls, aristocratic houses have ruled for generations, developing scientific marvels, fostering trade alliances, and building fleets of airships to keep the peace.

Captain Grimm commands the merchant ship, Predator. Fiercely loyal to Spire Albion, he has taken their side in the cold war with Spire Aurora, disrupting the enemy’s shipping lines by attacking their cargo vessels. But when the Predator is severely damaged in combat, leaving captain and crew grounded, Grimm is offered a proposition from the Spirearch of Albion—to join a team of agents on a vital mission in exchange for fully restoring Predator to its fighting glory.

And even as Grimm undertakes this dangerous task, 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 once more. And death will follow in its wake.

Frey is the captain of the Ketty Jay, leader of a small and highly dysfunctional band of layabouts. An inveterate womaniser and rogue, he and his gang make a living on the wrong side of the law, avoiding the heavily armed flying frigates of the Coalition Navy.

With their trio of ragged fighter craft, they run contraband, rob airships, and generally make a nuisance of themselves. So a hot tip on a cargo freighter loaded with valuables seems like a great prospect for an easy heist and a fast buck. Until the heist goes wrong, and the freighter explodes.

Suddenly Frey isn't just a nuisance anymore - he's public enemy number one, with the Coalition Navy on his tail and contractors hired to take him down. But Frey knows something they don't. That freighter was rigged to blow, and Frey has been framed to take the fall.

If he wants to prove it, he's going to have to catch the real culprit. He must face liars and lovers, dogfights and gunfights, Dukes and daemons. It's going to take all his criminal talents to prove he's not the criminal they think he is...