By that time the first rays of the sun had flooded the valley with a stream of golden light. Frank observed that a great many of the trees were covered with bloom, and that the surrounding country was rich in colour, the slopes across the river being scarlet with the bloom of the opium poppy.
Ling came to a halt before a carved door at the base of the tower. Opening this, he entered, followed by the boy, and found himself in a small circular room. Owing to the semi-darkness of the place, Frank could not at first take in his surroundings, but as soon as his eyes grew accustomed to the light, he was able to make out a narrow spiral staircase, built into the wall itself, which must have been at least five feet thick.
By means of this they ascended to the top of the tower, where they found themselves upon a narrow, projecting balcony, encircling a little room that reminded Frank of a summer-house. From this position they were able to look down upon the whole valley, which extended to the east as far as the eye could reach, but which to the left vanished at a distance of about a mile behind a great fold in the hills.
"We wait here," said Ling. "At any moment the treasure may arrive. If you take my advice you will go inside and snatch a few hours' sleep. There are strenuous days in front of you. You will have to work for your living. But I will reward you. I am a kind master, as those know well who serve me to the best of their ability."
Frank, thinking that he might as well follow this suggestion, entered the small circular chamber, and there lay down upon the floor, using his rolled coat as a pillow. Almost immediately he fell asleep, and must have slept for several hours, for, when Ling awakened him, he noticed that the sun had passed its meridian, and was already sinking towards the west.
The boy was exceedingly hungry, and accepted with eagerness the offer of a large piece of rice-cake which Ling produced from his pocket. Hardly had he taken a mouthful when he remembered his uncle and Mr Waldron.
"Your prisoners!" he exclaimed. "They will be starving!"
The Chinaman shook his head.
"Not so," said he, "whilst you were asleep, I returned to the junk and attended to their wants. I gave them food to eat and water to drink. Besides, I was anxious to see that all was well."
"Supposing they are found," said Frank, after a pause, "by some junk passing up or down the river? There is plenty of traffic upon the Sang River, as you know, this part of the country being thickly populated."