"Sure!" replied Fullaway. "Asked who you were--or I did." "You did," remarked Allerdyke. "Then he went off." "Describe him," said Chilverton. He listened attentively while Fullaway gave him a sketch of Van Koon's appearance. "Um!" he continued. "Do you mind my walking to your hotel with you? I believe I know that man, and I'd like to see him." A hall-porter was standing at the door of the Waldorf who had been there when the three men went out together at one o'clock. Fullaway beckoned him. "Seen anything of Mr. Van Koon?" he asked. "Mr. Van Koon?--yes, sir. He came back a few minutes after you and Mr. Allerdyke and he had gone out, got a suit-case from upstairs, left word that he'd be away for the night, and went off in a taxi, sir," answered the man. "Seemed to be in a great hurry, sir!" Before Fullaway could speak, Chilverton seized the hall-porter's arm. "Did you hear him give the cab-driver any direction?" "Yes, sir," replied the man promptly. "St. Pancras Station, sir." Without a word, Chilverton turned, hurried out to the pavement, and leapt into a taxi-cab that was standing there unengaged. In another instant the taxi-cab was off, and Allerdyke and Fullaway turned to each other. Then Allerdyke laughed. "That's why Van Koon turned back, Fullaway," he said in a low voice. "He recognized Chilverton. Now, then--why did that recognition make him run? And--who is he?" CHAPTER XXVIII THE FIRST PURSUIT For a moment Fullaway stood in the doorway of the hotel, staring towards the mouth of Kingsway, around the corner of which Chilverton's cab had already disappeared. Then he turned, gave Allerdyke a look of absolute non-comprehension, and with a sudden gesture, as of surrender to circumstances, walked into the hotel and made for the stairs. "That licks everything!" he muttered, as he and Allerdyke went up to the first floor. "Tell you what it is, Allerdyke--my poor brain is getting into a whirl! We've had quite enough excitement this morning in all conscience, and now this comes on top of it. Now, how in creation do you explain this last occurrence?" Allerdyke laughed cynically. "I don't know so much of the world as you do, Fullaway," he said, "but I don't think this needs much explanation. When a man makes himself suddenly scarce at sight of a well-known detective, I should say that man knows the detective wants him--badly! My impression is that at this moment your friend Van Koon is running away from Chilverton, and Chilverton's going hot-foot after him. And--"