The two men walked away together after taking leave of the millionaire and the Princess. But before they were clear of the courtyard, Chilverton caught them and tapped Fullaway on the elbow.
"Say!" he said confidentially. "You won't mind my asking you—who's this
Van Koon that you mentioned?"
"Man from our side who's been here in London all this spring," answered Fullaway promptly. "He was coming with Allerdyke and me just now, but he turned back—just when you and Delkin drove in here."
Chilverton gave Fullaway a quick look.
"Did he see me?" he asked.
"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.