Adventure and magic for 7-10 year-olds: Mad inventors, shark submarines and England's deepest lake under Creake Castle. Fred Longshanks is invited to tea in the village by Tobias Brown, Inventor Esquire. Before he knows it, he has embarked on an insane journey to get to the bottom of England's deepest lake in the grounds of his parents home in Creake Castle. What they discover on the journey changes both their lives for ever.