Blue arrives in the capital city of Altalus, where she is determined to find her friend Crow, the boy who was created to be a flying war machine, and Jack, the engineer who built him. But soon she is inadvertently kidnapped by Snow and Red, twins from the enemy side of their ten-year war. They set off on a dangerous adventure that brings them to the front lines of the war, and eventually realize that they must work together to help end it. But with...