“We go to the same man; Mark recommended him to me. Cartwright, in Wimpole Street.”

“Cartwright in Wimpole Street,” repeated Antony thoughtfully. “Yes, I can remember that. Cartwright in Wimpole Street. Did Cayley go to him too, by any chance?”

“I expect so. Oh, yes, I know he did. But what on earth⁠—”

“What was Mark’s general health like? Did he see a doctor much?”

“Hardly at all, I should think. He did a lot of early morning exercises which were supposed to make him bright and cheerful at breakfast. They didn’t do that, but they seemed to keep him pretty fit. Tony, I wish you’d⁠—”

Antony held up a hand and hushed him into silence.

“One last question,” he said. “Was Mark fond of swimming?”