The Prisoner and the Pirate (Hardcover) (ISBN-13: 9780988451278)

Open war has begun.

Grayden and Beren head for the front lines to defend against the invading army. But the enemy has a devastating new weapon, and now the defenders must learn a new tactic in order to survive.

Imprisoned, mutated, and forced to learn her new abilities, Raisa fears she will become a weapon against the ones she loves. Desperate to free her, Captain Marik races his airship to find Raisa, but it may already be too late.

Tensions rise in the fourth book in the Turrim Archive. Airship pirates, wizards, robots, and now paratroopers race to collide in a battle for the fate of the world.