the instrument. He recognized it at once.

"Is that Mr. Herbert Wrayson?" it asked.

"Yes!" Wrayson answered. "Who are you?"

"I am the person who spoke to you a few nights ago," was the answer.
"Never mind my name for the present. I wish to arrange a meeting--for
some time to-morrow. I have a matter--of business--to discuss with you."

"Anywhere--at any time," Wrayson answered, almost fiercely. "You cannot
be as anxious to see me as I am to know who you are."

The voice changed a little in its intonation. A note of mockery had
stolen into it.

"You flatter me," it said. "I trust that our meeting will be mutually
agreeable. You must excuse my coming to Battersea, as I understand that
your flat is subjected to a most inconvenient surveillance. May I call at
the office of your paper, at say eleven o'clock tomorrow?"

"Yes!" Wrayson answered. "You know where it is?"

"Certainly! I shall be there. A Mr. Bentham will ask for you.
Good night!"

Wrayson's unknown friend had rung off. He replaced the receiver and
turned to the Colonel.

"Do you know who that was?" he asked eagerly.