CHAPTER X.RETURNING to his office, Mr. Troy discovered, among the correspondence that was waiting for him, a letter from the very person whose welfare was still the uppermost subject in his mind. Isabel Miller wrote in these terms: “Dear Sir—My aunt, Miss Pink, is very desirous of consulting you professionally at the earliest opportunity. Although South Morden is within little more than half an hour’s railway ride from London, Miss Pink does not presume to ask you to visit her, being well aware of the value of your time. Will you, therefore, be so kind as to let me know when it will be convenient to you to receive my aunt at your office in London? Believe me, dear sir, respectfully yours, ISABEL MILLER. P.S.—I am further instructed to say that the regrettable event at Lady Lydiard’s house