"If you please," said Nick. "My force is pretty busy."

"Musgrave!" said the superintendent.

A man appeared so suddenly that he seemed to come out of the wall.

"Shadow the couple that has just left here," said Byrnes. "You are under
Mr. Carter's orders until dismissed by him."

Musgrave turned to Nick.

"I have no special instructions," said Nick, "except that you keep your
eyes on the woman."

The officer saluted, and vanished almost as quickly as he had come in.

At half-past seven o'clock that evening Musgrave was on guard outside
the flat, the address of which had been given to Nick by Jones.

An old man selling papers came along the street, calling "Extra!" in a
cracked voice.

Musgrave bought a paper.

"Well," said the newsman, in Nick Carter's voice, "what have you to
report?"

"From headquarters they went to an employment agency on Sixth avenue.
They engaged a colored girl as a servant.