So Dr Innes encouraged his engine and swung into this risky evolution. The hub of his off front wheel left a faint smudge on the Post Office's virgin white-wash.

"Gervase Innes, his mark," said Mrs Innes, and waved her hand to them. "Till Demonstration Day, and pray for fine weather for it! Au revoir!"

They watched the car grow small up the village street, and turned towards the field path and Leys.

" Nice people," Desterro said.

"Charming. Odd to think that we should never have met them if you had not had a craving for good coffee this morning."

"That is the kind of English, let me tell you in confidence, Miss Pym, that make every other nation on earth sick with envy. So quiet, so well-bred, so good to look at. They are poor, too, did you notice? Her blouse is quite washed-out. It used to be blue, the blouse; you could see when she leaned forward and her collar lifted a little. It is wrong that they should be so poor, people like that."

"It must have cost her a lot not to see her daughter when she was so near," Lucy said reflectively.

"Ah, but she has character, that woman. She was right not to come. None of the Seniors has one little particle of interest to spare this week. Take away even one little particle, and woops! the whole thing comes crashing down." She plucked an ox-eyed daisy from the bank by the bridge and gave the first giggle Lucy had ever heard from her. "I wonder how my colleagues are getting on with their one-leg-over-the-line puzzles."

Lucy was wondering how she herself would appear in Mary Innes's Sunday letter home. "It will be amusing," Mrs Innes had said, "to get back home and read all about you in Mary's Sunday letter. Something to do with relativity. Like coming back the previous night."

"It was strange that Mary Innes should have reminded you of someone in a portrait," she said to Desterro. "That is how she seemed to me, too."