"At Luddenham Marshes beyond Faversham, just before three o'clock."

"They'd hardly have got here, would they? They'd have to come through Canterbury, between thirty and forty miles, and with speed limits here and there they'd only just about do it."

"I'll wait here, then. You'll arrest them if they come?"

"That's a bit irregular, sir," said the inspector, rubbing his chin. "You saw them do the job?"

"Well, no, I didn't."

"Then you can't be sure of 'em?"

"I'm afraid I can't, but there wouldn't be two sets of foreigners on motor cycles. You could detain them on suspicion, couldn't you?"

"I might, if you would take the responsibility."

"Willingly. I'll keep a look-out then."

It occurred to Burton that the men might leave the cycles and approach on foot, so he closely scrutinised all the passengers of foreign appearance who passed on the way to the boat. None of them answered to Micklewright's description.