Susan nodded, quiet for a few moments, then said, "He was a friend of the family. We went and stayed with him during the Blitz in '41. Uncle Diggory wasn't a friend then, just a slightly intimidating old man with hundreds of antiquities and interesting things in his house. After we got back from Narnia, he was the only adult we told the truth. It turned out later-- much later-- that he'd been there when he was a boy." She sighed. "He and Aunt Polly were both on the train too."