“Beachy Head?”

“That sounds a bit like it … no.”

“She thinks the second word begins with a P,” Polly said.

He checked his list. “Bentley Priory?”

Eileen frowned. “No … it wasn’t Priory. It was Paddock or Place or …” She frowned, attempting to remember.

He checked the list again. “No Ps,” he said. “How about Biggin Hill?”

Eileen hesitated. “Perhaps … I’m not certain … I’m so sorry. I thought I’d know it when I heard it, but now I’ve heard so many … I’m not certain …”

“It would be a logical choice,” Mike said. “It was in the thick of the Battle of Britain.”

“So was Beachy Head,” Polly said. “And Bentley Priory. And that’s the one nearest Oxford. Perhaps we should try that first.”

“But it’s not just an airfield, it’s the RAF command center,” Mike said, “which means security will be tighter. Biggin Hill’s closest. I say we try that first and then the other two. Now, what about messages we can send? Did you tell Eileen my idea, Polly?”

“Yes,” she said, and to prevent Eileen from launching into an account of mystery novels which hadn’t been written yet, she continued, “How’s this for an ad? ‘Historian seeks situation involving travel. Available immediately’?”

“Great,” Mike said, scribbling it down. “And we can do variations of your ‘Meet me in Trafalgar Square or Kensington Gardens or the British Museum.’ ”

“There are lots of notices looking for soldiers who were at Dunkirk,” Eileen mused. “What about ‘Anyone having information regarding the whereabouts of Michael Davies, last seen at Dunkirk, contact E. O’Reilly,’ and Mrs. Rickett’s address?”

Mike wrote their suggestions down. “What about crosswords?” He pointed at the Herald’s puzzle. “I could compose one with our names in the clues, like ‘This bird wants a cracker.’ Or ‘What an Italian tower might say if asked its name?’ ”

“Absolutely not,” Polly said.

“Because they’re bad puns?”

“No, because a crossword nearly derailed D-Day.”

“How?”

“Two weeks before the invasion, five of the top-top-secret code words appeared in the Daily Herald’s crossword puzzle: ‘Overlord,’ ‘mulberry,’ ‘Utah,’ ‘sword,’ and I forget the other one. The military was convinced the Germans had tumbled to the invasion and was ready to call the entire invasion off.”

“Had they?” Eileen asked. “Tumbled to it?”

“No. The puzzle’s author was a schoolmaster who’d been doing them for years. He told the military his students and dozens of other people composed the clues and that they’d have no way of knowing which puzzle they’d be in, and in the end they decided it was just a bizarre coincidence.”

“And was it?” Mike asked.

“No. Forty years later the Herald published a story about it, and a man who’d been one of the schoolmaster’s students confessed he’d overheard two Army officers talking and had co-opted the words for clues with no idea what they meant.”

“But the puzzle incident wasn’t till 1944,” Mike said. “It isn’t likely British Intelligence would be reading crossword puzzles now—”