In the second thrilling adventure of The Sloping Meadow trilogy, Lucy continues as the storyteller. She with her friends experience a series of adventures. The story's exposition involves the saving of a drowning man. He is Bora, a very special man, keen to help his friend, Professor Mendoza; since he is ill, he will be sending his daughter first. This will be by a nuclear submarine. The enigmatic daughter arrives and is taken by Lucy and her friends to Box Hill, but on the visit to a London museum, North Kortana has already tracked the submarine and now activates its most ruthless spy, Hye Booh. A drone tries to film them all in Sloping Meadow but they are helped by Helen Scott, an MI6 officer. They are all kidnapped when the professor arrives and are dragged to an abandoned airport, where Helen Scott tries to save them...