Young Harry Dee arrives at St. Maure's thin and pale from his painful experiences involving the murder of his rich uncle. In this last book of the trilogy, Tom and Percy help Harry recover from his early trauma—which involves solving "the mystery of Tower Hill Mansion." After many wild experiences, the three boys graduate from St. Maure's and head toward the life work to which God is calling each of them as young men.

Father Francis Finn, S.J., was an early 20th-century Jesuit priest who wrote delightful children's stories about life in Jesuit boarding schools. Taken from his years of experience teaching Catholic boys, Father Finn writes about various human personalities with warmth and humor that makes for enjoyable reading for all types.