"Well, I suppose Ascanio is right—somebody impersonated him."
"Never, never will you use the brains the good God has given you. Recall to yourself some words I uttered after leaving the flat that night. I referred to the window-curtains not being drawn. We are in the month of June. It is still light at eight o'clock. The light is failing by half-past. Ça vous dit quelque chose? I perceive a struggling impression that you will arrive some day. Now let us continue. The coffee was, as I said, very black. Count Foscatini's teeth were magnificently white. Coffee stains the teeth. We reason from that that Count Foscatini did not drink any coffee. Yet there was coffee in all three cups. Why should anyone pretend Count Foscatini had drunk coffee when he had not done so?"
I shook my head, utterly bewildered.
"Come, I will help you. What evidence have we that Ascanio and his friend, or two men posing as them, ever came to the flat that night? Nobody saw them go in; nobody saw them go out. We have the evidence of one man and of a host of inanimate objects."
"You mean?"
