They heard from Mike, a scrawled note saying, “Arrived safely and am in comfortable lodgings. More later.” There was also a newspaper clipping in the envelope, of a sale on men’s suits at Townsend Brothers.

“Why did he write that? We already know it. And why did he put the clipping in?” Eileen asked. “Is he saying the jacket and waistcoat we sent him in were the wrong sort of clothes?”

“I don’t know,” Polly said, turning the clipping over, but the only thing on the back was a filled-in crossword puzzle.

When he’d phoned, he’d said he was doing crosswords as a cover while he looked for Gerald in pubs. Could he have accidentally stuck it in the envelope along with the note?

“Oh, Miss O’Reilly,” Miss Laburnum said, coming in from the parlor. “You had another letter in the afternoon post.” She handed it to her.

“Perhaps it explains this one,” Polly said, but it was from the vicar.

Eileen went up to their room to read it. Polly stayed in the vestibule, looking at the clipping. Mike had talked about sending a message in code, and she’d told him about the D-Day code words appearing in the Daily Herald puzzle. Could he have hidden some message in the crossword answers?

She grabbed a pencil, went up to the bathroom, locked the door, and sat down on the edge of the tub to decipher it. I hope the code’s not too complicated, she thought.

It wasn’t. It wasn’t even a code. He’d simply printed his message in the puzzle’s squares, beginning with 14 Across: NO LUCK YET CHECKING BILLETS DO U NO SITE OLD REMOTE DROP ST JOHNS WOOD OR DROPS HISTS USED B4 CLD B HOLDING OPEN EMERG XIT.

The lab had had a remote drop in St. John’s Wood, which they’d used for a number of years. Apparently Mike thought they might have opened it so they could employ it as an emergency exit, though why it would open if the problem was an increase in slippage, Polly didn’t know. But she wasn’t in a position to leave any stone unturned, so instead of going to meet the retrieval team at Trafalgar Square after work, she took the tube to St. John’s Wood. She didn’t know where the old remote drop was, but she hoped it was in some immediately obvious spot.

It wasn’t, and she didn’t know of any other London drops earlier historians had used. Except for hers in Hampstead Heath, which she’d last used just before midnight of VE-Day eve. At this point, it didn’t exist yet, but the lab might have reset its coordinates for 1940, so the next morning she put an ad in the Times, telling “R.T.” to meet her at St. Paul’s on Sunday.

Eileen was unexpectedly argumentative about it. “But we already placed one meeting the retrieval team at the National Gallery concert,” she said.

“You can do that one, and I’ll do St. Paul’s,” Polly said.

“But I’ve always wanted to see St. Paul’s,” Eileen argued. “Mr. Dunworthy was always talking about it. Why don’t I do it, and you do the concert?”