Harry Dee, a nervous, sensitive boy, given to somnambulism, arrives at St. Maure's following his experiences involving the murder of his rich uncle. Tom Playfair and Percy Wynn help to restore Harry to his former self, which includes solving "The Mystery of Tower Hill Mansion." This is the last book of the three of Fr. Finn's famous trio. (Summary by Maria Therese)

This episode includes AI-generated content.