sonal effects in the library, and accordingly Craig ransacked
the desk and the letter-file. There was practically nothing to be
discovered.

"Had Mr. Morowitch ever received any threats of robbery?" asked Craig,
as he stood before the desk.

"Not that I know of," replied Mrs. Morowitch. "Of course every jeweller
who carries a large stock of diamonds must be careful. But I don't think
my husband had any special reason to fear robbery. At least he never
said anything about it. Why do you ask?"

"Oh, nothing. I merely thought there might be some hint as to the
motives of the robbery," said Craig. He was fingering one of those
desk-calendars which have separate leaves for each day with blank spaces
for appointments.

"'Close deal Poissan,'" he read slowly from one of the entries, as if to
himself. "That's strange. It was the correspondence under the letter
'P' that was destroyed at the office, and there is nothing in the
letter-file here, either. Who was Poissan?"

Mrs. Morowitch hesitated, either from ignorance or from a desire to
evade the question. "A chemist, I think," she said doubtfully. "My
husband had some dealings with him--some discovery he was going to buy.
I don't know anything about it. I thought the deal was off."

"The deal?"

"Really, Mr. Kennedy, you had better ask Mr. Kahan. My husband talked
very, little to me about business affairs."

"But what was the discovery?"

"I don't know. I only heard Mr. Morowitch and Mr. Kahan refer to some
deal about a discovery regarding diamonds."

"Then Mr. Kahan knows about it?"

"I presume so."

"Thank you, Mrs. Morowitch," said Kennedy, when it was evident that she
either could not or would not add anything to what she had said. "Pardon
us for causing all this trouble."

"No trouble at all," she replied graciously, though I could see she was
intent on every word and motion of Kennedy and Andrews.

Kennedy stopped the car at a drug-store a few blocks away and asked for
the business telephone directory. In an instant, under chemists, he
put his finger on the name of Poissan--"Henri Poissan, electric
furnaces,--William St.," he read.

"I shall visit him to-morrow morning. Now for the doctor."

Doctor Thornton was an excellent specimen of the genus physician to
the wealthy--polished, cool, suave. One of Mr. Andrews's men, as I
have said, had seen him already, but the interview had been very
unsatisfactory. Evidently, however, the doctor had been turning