"To discover who was masquerading in this city under her name."

"Was there some one, sir?"

"So she told me; we went into that rather thoroughly. She claimed it had
been going on for some months; checks had been cashed at the bank; even
her servants had been approached by some one so closely resembling her as
to deceive them; and she had been reported at various places she never
visited. She was very much exercised over it."

"And she engaged you just to find this other woman?"

"Yes; her lawyer and Percival Coolidge only laughed at her story."

"But you believed it, sir?"

"Well, perhaps not at first altogether. It seemed too strange and
impossible. I thought something must have got on her nerves and caused
her to imagine things. But the first night I remained out there gave me a
shock. I do not know whether I left my door unlocked, or whether a
pass-key was used, but I woke up suddenly to discover a woman in the
room. I only had a glimpse of her, for she slipped out instantly, and
disappeared down the hall; but it was moonlight and I would have sworn
the intruder was Miss Natalie. I asked her the next day."

"And she denied being there?"

"Absolutely, and convinced me it was true. There is no doubt in my mind,
Sexton, but what she really is being impersonated by some one who