"
Antony laughed and apologized.
"Sorry, Bill. I felt like that suddenly. Just for the last
half-hour; just to end up with. I'll tell you everything now.
Not that there's anything to tell, really. It seems so easy when
you know it--so obvious. About Mr. Cartwright of Wimpole Street.
Of course he was just to identify the body."
"But whatever made you think of a dentist for that?"
"Who could do it better? Could you have done it? How could you?
You'd never gone bathing with Mark; you'd never seen him
stripped. He didn't swim. Could his doctor do it? Not unless
he'd had some particular operation, and perhaps not then. But
his dentists could--at any time, always--if he had been to his
dentist fairly often. Hence Mr. Cartwright of Wimpole Street."
Bill nodded thoughtfully and went back again to the letter.
"I see. And you told Cayley that you were telegraphing to
Cartwright to identify the body?"
"Yes. And then of course it was all up for him. Once we knew
that Robert was Mark we knew everything."
"How did you know?"
Antony got up from the breakfast table and began to fill his
pipe.
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