The Vanishing Prince
crime," said Fisher, and went and looked out of the window.
There was another silence, and then Sir Walter said, quietly: "What sort of notion have you really got in your head, Fisher? Have you developed a new theory about how this fellow escaped out of the ring round him?"
"He never escaped at all," answered the man at the window, without turning round. "He never escaped out of the ring because he was never inside the ring. He was not in this tower at all, at least not when we were surrounding it."
He turned and leaned back against the window, but, in spite of his usual listless manner, they almost fancied that the face in shadow was a little pale.
"I began to guess something of the sort when we were some way from the tower," he said. "Did you notice that sort of flash or flicker the candle gave before it was extinguished? I was almost certain it was only the last leap the flame gives when a candle burns itself out. And then I came into this room and I saw that."
He pointed at the table and Sir Walter caught his breath with a sort of curse at his own blindness. For the candle in the candlestick had obviously burned itself away to nothing and left him, mentally, at least, very completely in the dark.
"Then there is a sort of mathematical ques-
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