I should have checked it against other historical records, he thought, wondering how he could check it now. With the museum still shut …

“We’re from Indianapolis,” Brenda was saying. “Do you live here in London?”

If he said yes, she was likely to demand tourist information from him, and he had no idea what had been in London in 1995. “No, I’m from Oxford.”

An estate wagon was pulling in to the car park. He’d be able to ask whoever was in it about the opening.

“The museum should be opening shortly,” he told Brenda. “There are some interesting exhibits in the courtyard that you and your husband might like to look at in the meantime.” But she wasn’t listening.

“You’re from Oxford?” she cried. “We’re going there on Wednesday. You’ve got to tell us what we should see while we’re there.”

He glanced out at the car park. The woman stepping out of the estate wagon and going round to open the back was too young to be one of the women he was looking for. She couldn’t be more than forty, and she was wearing a business suit and high-heeled shoes and was getting an armload of books and papers out of the back. Someone who worked here. She would definitely know whether the opening was today.

“We want to see the university,” Brenda was saying, “but I couldn’t find it on the map, only a lot of colleges.”

He explained that the colleges were the university, and told her to go see Balliol. “And Magdalen,” he said, trying to think what would have been in Oxford in 1995. “And the Ashmolean Museum.”

“Is that where they have the dodo?” she asked. “I’m dying to see the dodo and all the other Alice in Wonderland stuff.”

“No, the dodo’s at the Natural History Museum,” he said.

“Oh, where’s that?” she asked, digging in her tote bag. “Bob!” she called. “Do you have the guidebook?” But Bob had gone down into the courtyard to look at the anti-aircraft gun and either couldn’t hear her or was ignoring her. “He’s got the guidebook,” she said. “Can you show me where the—what did you say it was? The Nature Museum?”

“The Natural History Museum.” He glanced quickly out toward the car park, but the woman in the business suit was still unloading things from her car, and no one else had pulled in. He went down the stairs and into the courtyard with Brenda.

Bob didn’t have the guidebook. “I thought you had it.”

“No, I gave it to you, remember? Right before we left the hotel?” she said, but after digging some more, she found it and got it open to the section on Oxford, and he showed her where the museum was and went back to the steps. Just in time to see the business-suited woman disappear up them and inside, which meant the doors must be open. But when he tried them, they were still locked, and there were still no cars pulling in to the car park. And it was beginning to rain.