Hence it was possible that though Green had succeeded, as I say, either in intercepting or obtaining access to Mullen’s correspondence, he might not be any nearer to discovering the criminal’s actual whereabouts. But if Green merely took a copy of this letter and then let it go on to Mullen, the latter would very likely fall into the trap of keeping the appointment which he had made with his sister, and could then be arrested and handed over to justice. For though his sister had--lest the letter should fall into other hands than those for which it was intended--cautiously refrained from mentioning her own or her husband’s name, or from giving any address except that of a foreign town, she had, woman-like, forgotten that there were not likely to be many large steam yachts belonging to an English gentleman, whose wife was in bad health, lying at the same moment off such a place as Stavanger. An experienced inquiry agent like Green would have no difficulty in learning the name of such a vessel and of its owner; and that he had taken steps to obtain the necessary information was very clear from the second document which I found in his cigar-case. Here it is-- Viscount Dungannon, } { Mary Hatherwick shot in U. S. A. } { Coyne, daughter of in 1881, } and { John Coyne, Esq., } { of Galway, had son, known as James Cross, who afterwards assumed the name of James Mullen. ----:---- This Mary { was } Henry Cross Hatherwick Coyne { afterwards } (d. 1886); (d. 1880) { married to } and had daughter, Flora Hatherwick Cross, b. 1865; m. in 1885 to Stanley Burgoyne, Esq. The meaning of this document--a document which affords some interesting data to the student of heredity--evidently was that James Mullen was the illegitimate son of the famous, and also infamous, Lord Dungannon by a Miss Mary Coyne, the daughter of an Irish gentleman. The fact that Miss Coyne had been seduced and had given birth to a child had probably been kept a secret, for if Green’s notes were correct she had afterwards married a Mr. Henry Cross, by whom she had a daughter, Flora (now Mrs. Stanley Burgoyne), who was therefore Mullen’s half-sister, and the writer of the letter a copy of which I had found in Green’s cigar-case.