Anne reflected a moment. "No," she said. "There was no writing on it then."

"Do you think your sister wrote on the back of the portrait before she committed suicide?"

"If the writing on the back of the photograph is the same as that on this letter--or rather, envelope--I do not think she wrote it. This is not my sister's handwriting."

"You cannot think who wrote it?"

"No, Mr. Fanks; I am entirely ignorant of that."

Needless to say, Fanks took his departure from Briar Cottage in a very puzzled frame of mind. Before leaving, he told Miss Colmer that he would call again the next day. When he got back to his hotel he asked himself how much of her story he could believe; and he came to the conclusion that not one word of it was true. He was as far off discovery as ever.

[CHAPTER XVIII].

ON THE TWENTY-FIRST OF JUNE.

Up to the present time the visit of Fanks to Taxton-on-Thames had been a complete failure. He had been thwarted by Hersham; he more than suspected that he had been tricked by Anne; and he saw no means of obtaining any information likely to lead to the elucidation of the mystery which enveloped the death of Sir Gregory Fellenger. It was in very low spirits that the detective returned to the Royal Arms, and after a good dinner, which somewhat cheered him, he sat down with a pipe to consider what he should do next.

He had no hope of obtaining any information from Hersham or Anne Colmer, as for some reason or another each of them declined to speak. Fanks thought they could put him on the right track if they pleased; but he saw no means by which he could force them to speak openly. In spite of his threats he could arrest neither of them, as he had not sufficient evidence to do so. Unable, therefore, to force or to flatter them into plain speaking, he was completely baffled in his efforts to solve the enigma in this direction. For the time being he was at a standstill.