“It was wise of you to have the lad come and see me. I certainly agree that Mr. Duke’s proposal to him was a most unusual one. As soon as the boy left I tried to contact Duke, but discovered that he was in Cuba and was expected back today.”

“Yes, I know,” Vicki said.

Mr. Quayle looked at her sharply for a moment and then went on:

“However, I did make some discreet inquiries about him. It appears that he is in the import-export business, engaged in trade between the United States and Cuba. So far as I can tell, his trading is thoroughly respectable and legitimate, being principally concerned with sugar, although he also deals in laces, perfumes, antiques, and other luxury items. He seems to be fairly well known here at the airport, since a great many of his shipments come in by air express and air freight.”

The FBI investigator grinned and reflectively stroked the stubble on his square jaw.

“You remarked a moment ago that you knew Mr. Duke had been in Cuba. Do I gather that you have been doing some sleuthing on your own?”

“A few things were worrying me,” Vicki said seriously, “and I didn’t want to bother you with them until I had a little more to go on. The other day—” She paused and then started over again. “You may remember that when you questioned our crew the other day I mentioned an old man on the flight who seemed to be behaving in a peculiar manner? At the time you didn’t attach much importance to it.”

Mr. Quayle nodded his head slowly as he thought back over the Friday meeting.

“Uh-huh,” he said.

“Well,” Vicki went on, “I saw him again today.”