the heart of your house—a potent, sleepless, fiendish thing; and far from wondering at all that has happened, I only marvel that worse did not befall. But I have the magic talisman, the 'open sesame.' I am safe enough even if I am mistaken. Though my fires are burning low, it will take more than your Grey Room to extinguish them. I hold the clue of the labyrinth, and shall pass safely in and out again. To-morrow I can tell you if I am right."
"I confess that any such plan is most disagreeable to me. I have been specially directed by the authorities to allow no man to make further experiments alone."
Vergilio Mannetti showed a trace of testiness.
"Forgive me, but your mind moves without its usual agility, my friend. Have I not told you everything? What matters Scotland Yard, seeing that it is entirely in the dark, while I have the light? Let them hear that they are bats and owls, and that one old man has outwitted the pack of them!"
"You have, as you say, told us much, my dear signor, and much that you have said is deeply interesting. In your mind it may be that these various facts are related, and bring you to some sort of conclusion bearing on the Grey Room; but for us it is not so. These statements leave us where they find us; they hang on nothing, not even upon one another in our ears. I speak plainly, since this is a matter for plain speaking. It is natural that you should not feel as we feel; but I need not remind you that what to you is
