"Mind these three steps," warned Smith, glancing back. "I found my mind persistently dwelling upon the matter of that weird rapping, Petrie, and I recollected the situation of Sir Lionel's room, on the southeast front. A brief inspection revealed the fact that, by means of a kindly branch of ivy, I could reach the roof of the east tower from my window."
"Well?"
"One may walk from there along the roof of the southeast front, and by lying face downwards at the point where it projects above the main entrance look into Sir Lionel's room!"
"I saw you go!"
"I feared that some one was watching me, but that it was you I had never supposed. Neither Barton nor his man are in that room, Petrie! They have been spirited away! This is Kâramaneh's door."
He grasped me by the arm, at the same time directing the light upon a closed door before which we stood. I raised my fist and beat upon the panels; then, every muscle tensed and my heart throbbing wildly, I listened for the girl's voice.
Not a sound broke that deathly stillness except the beating of my own heart, which, I thought, must surely be audible to my companion. Frantically I hurled myself against the stubborn oak, but Smith thrust me back.
"Useless, Petrie!" he said—"useless. This room is in the base of the east tower, yours is above it and mine at the top. The corridors approaching the three floors deceive one, but the fact remains. I have no positive evidence, but I would wager all I possess that there is a stair in the thickness of the wall, and hidden doors in the paneling of the three apartments. The Yellow group has somehow obtained possession of a plan of the historic secret passages and chambers of Graywater Park. Homopoulo is the spy in the household; and Sir Lionel, with his man Kennedy, was removed directly the invitation to us had been posted. The group will know by now that we have escaped them, but Kâramaneh …"
"Smith!" I groaned, "Smith! What can we do? What has befallen her? …"
"This way!" he snapped. "We are not beaten yet!"