A new adventure novel filled with high-action and aerial invention from the bestselling author of the Artemis Fowl series. Conor Boekhart is blamed for murdering the king and thrown into prison. While in prison, Conor passes time by scratching designs for flying machines into the walls. After two years, Conor plans and executes a daring escape. But he soon decides he must return to reclaim diamonds he buried there. He builds a glider and becomes the mysterious Airman flying around the prison island. Then Conor's entire family is arrested for his crime and escape. Conor knows that to save them he will have to build the ultimate flying machine of his dreams.