“Yes, sir,” replied one cabby. “I took them to the Charing Cross.”

“Thank you,” said Puffer, in a tone of satisfaction. “That is just what I wanted to find out. Here’s a shilling.”

“Thank you, sir. You are a gentleman.”

“And you may take me to the Charing Cross. I shall probably find them there.”

“I should make a good detective,” thought the professor complacently, as he rolled through the streets. “Master Bernard Brooks will find that he hasn’t made much in his attempt to outwit me. Indeed I am better off for it, as he has been obliged to pay his own fare to London.”

When he reached the hotel, he inquired at the office: “Is there an American gentleman named Sturgis here?”

“Yes, sir.”

“Where is he now?”

“In the dining-room, taking dinner.”

Professor Puffer smiled maliciously.