The Professor made no reference whatever to the case, either to Harold or to Hanslet. The latter during his infrequent visits to the house in Westbourne Terrace, made no reference to the case. He was becoming more and more convinced that the Professor’s interview with the Black Sailor had been a pure hallucination; that the Professor, having imagined the sequel to his theory of the jurymen, had somehow been under the illusion that the events of his imagination had actually taken place. In his own mind, however, he was by no means satisfied with the official view of the matter, of which Whyland was the principal exponent. It left so much to be explained, chiefly Copperdock’s motive, to say nothing of his methods. To begin with, how had he contrived to murder Mr. Tovey, when at the moment of the latter’s death he was sitting comfortably before his own fire? And, if the answer to this was that he had accomplices, who and where were they?