The Last Egyptian by L. Frank Baum

At daybreak the dragoman thrust his head stealthily through the arch and looked at Kāra's sleeping form with suspicion. He had visited the young man's house in the evening and found him absent and Hatatcha's body also gone. He came again later, and once more at midnight, and still Hatatcha's dead form and her grandson's quick one were alike missing.

Then the dragoman, wishing to know to what secret place the old woman's remains had been taken, and from which direction Kāra returned, and having a fair share of oriental shrewdness, had stretched two threads across the narrow street -- one on either side the arch -- and afterward returned to his couch in the house of old Sĕra to sleep.