Nadia was at Brad’s side. Suddenly she clutched his arm with a nervous movement. “What is it?” he asked, seeming to awaken from a trance. “That man! Look there!” She made a gesture, and he looked in the direction indicated. Standing at an angle of the wall, where the shadows were upon him, was the same man to whom she had called his attention on the steps of the hotel. “He has followed me here!” she declared nervously. “Oh, he has, has he?” growled the Texan, his face flushing with anger. “Well, I sure am going to interview him some, right away.” He brushed off her hand and started toward the mysterious stranger. Immediately the unknown turned and disappeared beyond the corner of the wall. Dick had seen the stranger, also, and he joined Buckhart at once, saying: “Come ahead, Brad. It’s time to find out if he’s following us round.” Budthorne had hastened to his sister’s side. The boys ran to the point of the wall. When they reached the spot, they could see nothing of the man. “He can’t be far away,” said Dick. A few moments later they discovered the man walking hastily down the hill. Unless they chose to run after him, there was no prospect of overtaking him. “Better let him go this time,” advised Dick. “All right,” muttered the Texan; “but he is causing me to wax wroth some, and I’ll give him a game of talk the next time I find him dogging us. Who do you reckon he is, pard?” “I am unable to answer the question,” admitted Dick; “but, by his appearance, he seems to be a Turk.” “That’s right. I don’t fancy being spied on by a Turk, just at present. We’re not far enough away from Damascus. He may be one of the sultan’s secret police, sent after us for that little affair in which we were recently involved.” “I thought of that myself. I’m not anxious to be arrested and carried back to Damascus.” “I should say not! That would be mighty bad business. Still, I don’t think——” Dick checked his companion with an exclamation. Another man had joined the one who was rapidly descending the hill. Both boys obtained a glimpse of this second person before both disappeared into the shadows below. “Did you see him, Brad?” asked Dick. “Did you get a fair view of him?” “Just a look, partner, but I swear there was something a heap familiar about him. The way he carried his head—his walk—— I’ve seen that galoot before.” “And so have I. Shall we attempt to overtake them? I’d give something to get a look at his face.” But they decided it was too late, as there was little chance of overtaking those men in the narrow and gloomy streets of Cairo. Besides, in order to pursue the mysterious ones, they would be compelled to abandon Nadia and her brother. So they returned and found Dunbar and Nadia waiting, and a trifle nervous. “It’s all right,” declared Dick diplomatically. “Of course, the man had a right to come up here and view the sunset. He’s gone.”