CHAPTER III

_Into the Unknown_ We stood in the boarded room which was Derek's laboratory. Our preparations had been simple: Derek had made them all in advance. There was little left to do. The laboratory was a small room of board walls, board ceiling and floor. Windowless, with a single door opening into the cellar of the apartment house. Derek had locked the door after us as we entered. He said, "I have sent my man servant away for a week. The people in the house here think I have gone away on a vacation. No one will miss us,…