Mr. Wrench shook his head, and said, “Not a soul—​not one person.”

“There is a servant, of course, or servants?”

“Only one, I believe.”

“Oh! only one—​eh?”

“As far as I have been able to ascertain.”

“And is she to be got at? Most domestic servants are.”

“Well, that remains to be seen. I have not made any attempt to enlist her in our service, and for this reason: should she be faithful to her mistress—​which is more than likely—​it would be putting them on their guard.”

“Just so; that is clear enough, Wrench. Well, I cannot do better than leave it in your hands. You know what is requisite—​proofs, clear and unmistakeable proofs, that he has committed adultery.”

“When I obtain further information I will see you again,” returned the detective, as he left the lawyer’s chambers.

Mr. Wrench pondered over the matter.