“Professor Zenas Gunn, accompanied by Dick Merriwell and Brad Buckhart. Is Miss Ketchum, of Boston, with you?” “I am here,” answered the well-known voice of Sarah Ann. “We have passed through a most awful and excruciating experience, the faintest remembrance of which will forever seem like a fearful nightmare. I am glad you have found us, for now you can assist us in getting out of this frightful place.” “I am sure we would like to do so,” said Dick; “but, unfortunately, like yourselves, we do not know which way to turn. How did you get here?” The major explained as the two boats bumped together, and floated thus. Like the professor and the boys, he and Miss Ketchum had visited the lake in company with a guide, who had vanished in a mysterious and unaccountable manner. They fancied they had been afloat for days on the bosom of the lake, and they were in a pitiful condition of collapse and fright, although the major had braced up wonderfully for a time. “This seems to be the usual manner of treating visitors,” said Dick. “We’ve used our last match,” said the major. “I lighted it a few minutes ago. We had been saving it. I am afraid we will never be able to escape. I have about given up hope.” “It is the work of that terrible Turk who urged you into the duel with Professor Gunn, major,” said the woman from Boston. “He warned us to leave Constantinople, but we refused to go, and he told us we would disappear mysteriously.” “Are you speaking of Aziz Achmet?” asked Dick. “That is what he calls himself.” “Then you have seen him since the morning of the duel?” “Seen him!” indignantly exclaimed the major. “We have seen him everywhere, suh. He has followed us and watched us wherever we went. We couldn’t make a move that he wouldn’t turn up. Twice he told us that we must leave the city and the country.” “I wish now,” confessed Miss Ketchum, “that we had obeyed him. Don’t you, major?” “Well,” answered the little man, with a touch of reluctance in his voice, “I must confess, madam, that I believe it would have been much better fo’ us if we had obeyed.” Barely were these words spoken when, in the pall of darkness near by, a voice demanded: “Are you ready to depart now? Will you depart at once? Do you, one and all, swear by your God that you will lose no time about going?”. Needless to say, the sound of that voice affected them all much like a sudden clap of thunder on a clear and sunny day. The woman gave a little scream, the major uttered a smothered oath, the professor gasped for breath, while both Dick and Brad sat bolt upright, their nerves tense.