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 pass. Fisher was fairly sure that he had before him a mathematical problem in an inclosed space. His instinct had been from the first so attuned to the tragedy that it would have been almost a relief to him to find the corpse. He would have been grieved, but not horrified, to come on the nobleman's body dangling from one of his own trees as from a gibbet, or floating in his own pool like a pallid weed. What horrified him was to find nothing.

He soon become conscious that he was not alone even in his most individual and isolated experiments. He often found a figure following him like his shadow, in silent and almost secret clearings in the plantation or outlying nooks and corners of the old wall. The dark-mustached mouth was as mute as the deep eyes were mobile, darting incessantly hither and thither, but it was clear that Brain of the Indian police had taken up the trail like an old hunter after a tiger. Seeing that he was the only personal friend of the vanished man, this seemed natural enough, and Fisher resolved to deal frankly with him.

"This silence is rather a social strain," he said. "May I break the ice by talking about the weather?—which, by the way, has already broken the ice. I know that breaking the ice might be a rather melancholy metaphor in this case."

"I don't think so," replied Brain, shortly. "I