FOUR IMPORTANT CHARACTERS
"Oh, yes, sir; that is Mr. Mann. At the yard we call him 'The Man Who Knows!'"
"Is he a detective?"
The constable shook his head.
"From what I understand, sir, he does a lot of work for the commissioner and for the government. We have orders never to interfere with him or refuse him any information that we can give."
"The Man Who Knows?" repeated Frank, with a puzzled frown. "What an extraordinary person! What does he know?" he asked suddenly.
"Everything," said the constable comprehensively.
A few minutes later Frank was walking slowly toward Holborn.
"You seem to be rather depressed," smiled the girl.
"Confound that fellow!" said Frank, breaking his silence. "I wonder how he comes to know all about uncle?" He shrugged his shoulders. "Well, dear, this is not a very
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