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Rh that it was not a sane one. He had known a case when a madman, unsuspected of madness, had operated with extraordinary skill to destroy innocent persons and escape detection, and already he was disposed to believe that among the household of Chadlands might hide such an insane criminal.

On a similar plane, it was in his personal experience that weak-minded persons, possessed with a desire to do something out of the common, had often planned and perpetrated apparent physical phenomena, and created an appearance of supernatural visitations, only exposed after great difficulty by professional research. Along such lines, therefore, this man was prepared to operate, and he believed it might be possible that a maniac, in possession of some physical secret, would be found among the inhabitants of the manor house. He did not, however, elaborate this opinion, but kept it to himself. Indeed, the human element of jealousy, so often responsible for the frustration of the worthiest human ambitions, was not absent from the minds of the four now concerned with this problem.

Each desired to solve it, and while no rivalry existed among them, save in the case of the two older men, it was certain that the eldest of the four would not lose his hold on his own theory, or be at very vital pains to stultify it. All, however, were fully conscious of the danger before them, and Frith, from the first, directed that none was to work alone, either in the Grey Room or elsewhere.