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...