Did the boy get any letters from France? "No, I never saw any. "Do you understand me, Dr Huxtable?" Holmes said. "Did someone take the boy away, or did the boy go freely? because he had a letter from France perhaps. "I don't know," said Dr Huxtable. "He only had letters from his father, I think." Were father and son very friendly?' "The Duke is not er not a very friendly man, Mr Holmes. He's not a bad father, but he is a Government Minister and has a lot of things to do. So the boy felt more friendly to his mother?' "Did he say that?" "No Did the Duke tell you, then? "Oh no! The Duke never talks about things like that.' "So how do you know?' "Mr James Wilder, the Duke's secretary, told me "I see said Holmes. "That last letter of the Duke's where is it now?' "The boy took it with him,' Dr Huxtable said. "It's not in his room. Mr Holmes our train leaves in half an hour. "Right," said Holmes. He looked at me. 'Watson, let's get ready and go off to the north with Dr Huxtable. Perhaps we can find some answers to this mystery.'