"And where is the body now?" asked Zena.

"I do not know, but you tempt me to guesswork. Sir Grenville was a keen
yachtsman, and probably he is on board his yacht still resting in his
coffin, waiting for his wife to bring the antidote to the drug. His son
and Mr. Thompson took the body that night in the car. There must have
been two of them to deal with the burden, for I imagine the yacht had no
crew on her at the time. They would hardly take others into their
confidence. As everything had to be accomplished between eleven o'clock
at night and before dawn the next day, I imagine the yacht was lying
somewhere in the Thames estuary. I grant this is guesswork, Wigan."

"I do not see why it was necessary the theft should become known," I
said.

"It would occasion delay in the settlement of the estate. It placed
difficulties in the way of the rightful heir, It would help to throw a
distinct doubt whether, in spite of all the evidence that might be
forthcoming, Sir Grenville had committed fraud. There was even a
possibility that the son might be left in possession after all. I daresay
we shall learn more when we tackle Lady Rusholm and her son to-morrow."

When we went to Queen's Square next morning we found that Lady Rusholm
was gone. She had, in fact, already gone when her son told us he was
trying to persuade her to go. Mr. Thompson had left later in the day.

We found that even Quarles's guesswork was very near the actual facts,
although he had hardly given Lady Rusholm sufficient credit for the
working out of the scheme. The real heir, Sir John's nephew, had died in
Ceylon before Baxter--that was Sir Grenville's real name--had married. On