Everyone Danny Caulfield is close to is in danger. The man Danny thought was his father has been shot. The woman he thought was his mother has been taken hostage. The school for spies he calls home and the classmates he calls friends are vulnerable to attack. And the Upper and Lower Worlds have been driven to the brink of war by the devious hand of Ambrose Longford, the leader of the group of master spies known as the Ring of Five. To save those he loves, Danny must confront the most destructive forces in two worlds--and in himself.