Considered in leisurely retrospect, that visit offered quite a number of problems that called for elucidation. There was the patient’s condition, for instance. Any doubt as to the cause of his symptoms was set at rest by the effect of the antidotes. Mr. Graves was certainly under the influence of morphine, and the only doubtful question was how he had become so. That he had taken the poison himself was incredible. No morphinomaniac would take such a knockdown dose. It was practically certain that the poison had been administered by someone else, and, on Mr. Weiss’s own showing, there was no one but himself and the housekeeper who could have administered it. And to this conclusion all the other very queer circumstances pointed.