organisation. Quite so, Mr. Dale. I only ask you to consider the possibilities if what I say is true. Now let us proceed. I am going to take you into three rooms—the three whose doors you see ahead of you. You will notice that, including the one you have just left, there are four on this corridor. I do not wish to strain your credulity, or play tricks upon you; so I am going to ask you to fix an approximate idea of the length of the corridor in your mind, as it will perhaps enable you to account more readily for what may appear to be a discrepancy in the corresponding size of the rooms."
One of the men opened the door ahead. Jimmie Dale, at a sign from his conductor, moved forward and entered. Just what he had expected to find he could not have told; his brain was whirling, partly from his aching head, partly from his desperate effort to conceive some way of escape from the peril which, for all his nonchalance, he knew only too well was the gravest he had ever faced; but what he saw was simply a cozily furnished bedroom. There was nothing peculiar about it; nothing out of the way, except perhaps that it was rather narrow.
And then suddenly, rubbing his eyes involuntarily, he was staring in a dazed way before him. The whole right-hand side of the wall was sinking without a sound into the floor, increasing the width of the room by some five or six feet—and in this space was disclosed what appeared to be a sort of chemical laboratory, elaborately equipped, extending the entire length of the room.
"The wall is purely a matter of mechanical construction, operated hydraulically." The man was speaking softly at Jimmie Dale's side. "The room beneath is built to correspond; the base, ceiling, and wall mouldings here do not have to be very ingenious to effect a disguise. I might say, however, that few visitors, other than yourself, have ever seen anything here but a bedroom." He waved his hand toward the retorts, the racks of test tubes, the hundred and one articles that strewed the laboratory bench. "As for this,
