So astonished were we that we did not hear the doorbell ring.
Jennings answered it and admitted two men.

"Is Professor Kennedy here?" asked one. "We have been to his
apartment and to the laboratory."

"I'll see," said Jennings discretely, taking the card of one of
them and leaving them in the drawing-room.

"Two gentlemen to see you, Mr. Kennedy," Jennings interrupted our
congratulations, handing Craig a card. "Shall I tell them you are
here, sir?"

Craig glanced at the card. "I wonder what that can be?" he said,
turning the card toward us.

It was engraved:

W. R. Barnes U. S. Secret Service.

"Yes, I'll see them," he said, then to us, "Please excuse me?"

Elaine, Aunt Josephine and I strolled off in the palms toward the
Fifth Avenue side, while Jennings went out toward the back of the
house.

"Well, gentlemen," greeted Kennedy as he met the two detectives,
"what can I do for you?"

The leader looked about, then leaned over and whispered, "We've