An instant later a broad, flat head slowly reared itself from beneath the red table-cover which hung down almost to the floor, rose higher and higher until the black, beady, merciless eyes were set upon mine, and in that brief instant of supreme suspense my attention became riveted on the strange, slate-grey mark between and just behind the reptile's cruel eyes. Then, as its head suddenly shot back, Osborne dashed towards the door. Once, twice, three times he pulled frantically at the handle with all his force. "Good God! Berrington," he cried, his face blanched to the lips, "we're locked in!" Almost as he spoke, the serpent with head extended swept forward towards us, along the floor. I held my breath. Escape from its venomous fangs was impossible. We had been trapped! CHAPTER III A HAMPSTEAD MYSTERY With a shriek of alarm I leapt to the further side of the table which stood in the middle of the room, and at that moment hurried footsteps became audible. Our wild shouts for help had evidently been heard, for someone was hurrying down the bare oak stairs into the hall. "Hang this confounded lock—it catches!" we heard a voice exclaim as the handle turned. Then an instant later the door was flung open, and Gastrell stood before us. "I am dreadfully sorry, you fellows," he said apologetically, "that you should have been alarmed in this way, because I can assure you that my tame cobra, 'Maharaja,' is quite harmless—look at him now," and we saw that the horrid reptile had swung round the instant its master had entered, and was sliding towards his feet. "He's a pet of mine—I brought him home with me, and he follows me like a dog—no, you needn't be in the least nervous," he added quickly, seeing that I instinctively edged away as the reptile passed. "I'm awfully sorry to have kept you waiting. I must apologize, too, for that confounded door—I myself got locked in here the other day. My wife told you I was out, but I was not. I came in by the side door, and she didn't know I was back, because I went straight upstairs. If you'll wait a moment I'll take our friend 'Maharaja' out." He left the room, and the snake slid rapidly along the floor after him, almost, as he had said, like a dog following his steps. "A nice cheerful pet to keep," I remarked, annoyed at my experience; but at that moment the mysterious Gastrell bustled in alone. "So sorry," he said, and, after thanking us for coming out so far to ascertain if he had lost his purse, he pulled up a chair, seated himself between us, lit a big cigar, and helped us to whiskey from a silver tantalus. "You had better add the soda yourselves," he said. "And now there is something I want to say to you both. You must have been surprised at my declaring so emphatically this evening that I had not met either of you before—eh?" "I can answer for myself," Osborne exclaimed quickly. "Are you going to admit, after all, that you were on the _Masonic_?"