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 knock-down 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.
What were these circumstances?
They were, as I have said, numerous, though many of them seemed trivial.