Scott is twelve. He has dreams that sometimes predict the future, or reveal something that no one else knows. No one believes him. His four year old sister, Lolly, has been lost at sea when a tour boat is hit by a rogue wave and capsizes. Everyone knows she's dead. Except Scott. And Sir William, who knows that Scott's dreams are real. Sir William, Mac and Scott fly away in a hot air balloon powered air ship to rescue her. Sounds simple. Not a chance.