The flood water that washes down from the upper reaches of the Gold Rush River collides with the water downstream, creating a large whirlpool in this place. When the flood water rises, the force of the water increases greatly, forming a countercurrent, so the water level rises rapidly and floods the bridge deck.

"Xiao Bin, go to the opposite shore, run!"

The two men ran across the bridge with a splash of water, and then went straight up the slope that led to the mound.

Looking down from the mound, you can see that the island is surrounded by whirlpools of the river. The wooden bridge has been flooded by the river, but the higher pigeon houses are still unharmed. In the small window of the pigeon house, the two white and bloodied faces of the Xie Yan sisters were revealed. Lang Xiaobai waved his hand at them, suggesting that they wait patiently.

"Not going to rescue them?"

"No need! These tides are nothing more than when the river swells, not flash torrents. When the tide recedes, the water level immediately drops. ”

"How long will it take to retreat?"

"About half an hour. When the tide goes down, we return to the island. ”

"Why did you go out of your way to the mound?"

"There's a reason."

"Can you tell me?"

"You'll know right away, hold on a little longer, Xiao Bin!"

The two of them sat side by side on the big rocks of the mound, looking out over the river. At this time, the storm and rain have already weakened, and the rolling waves have gradually quieted down, and even the water level has dropped a lot.

Half an hour later, the wooden bridge resurfaced and the water receded from the bridge.

"Alright, now let's go back to the island, they're going to be scared to death!" Xiao Bin said and stood up.

"But we have one more important thing to do before we return to the island!"

"What's the matter?"

"Have you forgotten that I came to the mound for a reason?"

"Ah, yes, you said that. However, I was very worried about the sisters on the island. ”

"You're so kind to girls, Xiao Bin."

Lang Xiaobai got up and left the big stone with a smile, and then said, "Now I will tell you the reason why I came to the mound. First of all, let me ask you, do you believe that Mr. Xie Yunqing can refine gold?"

"I don't believe it, the alchemy argument simply doesn't make sense."

"However, Mr. Xie Yunqing gave the notary Yan Junqing gold powder, and lied that it was refined by himself."

"Well, I think he must have found the gold sand somewhere."

"What place? Where do you think it is?"

"It's supposed to be in the Gold Rush, isn't it?"

"Yes, we're here to get the golden sand, and that's why I'm talking about it."

"So, what are we doing here?"

"Looking for a tool to dig for gold sand!"

"Oh? Didn't we just put that metal mesh into the river?"

"It's not enough to have the Internet, we have to find other aids. It is likely that the fishing tools were hidden in the mound. ”

"Where?"

"It's where there used to be three willow trees. Now, that place is full of weeds, and the tools we use are in that pile of grass. ”

Sure enough, hidden in the weeds was a long fishing net (a net for fishing), which was also a finely woven net held in place by an iron frame.

"The gold sand is brought from upstream by the waves, and then it is blocked in a large net under the bridge, and then it is fished up with this net. Go give it a try!"

Xiao Bin stepped on the big rock on the shore with both feet, threw the fishing net into the water, let it sink to the bottom, and then pulled it out of the water.

Xiao Bin lifted the fishing net upward, and with a "brush" sound, the river water leaked through the gap in the fishing net, leaving only aquatic weeds and sand. In the middle of the sand is something shiny, it is gold sand!

Xiao Bin's eyes were bloodshot and red because of excitement. He immediately bent down to fetch the gold sand, and his movements became more and more rapid, until all the gold sand he had scooped up was clean.

Xiao Bin and Lang Xiaobai carried the bag containing gold sand back to the pigeon house, and Xie Yan and Juanzi were shocked when they saw what they were holding.

The four of them returned to the manor together and saw Ah Qiao re-bandaging Ah Cai.

"Look, Ah Cai, this is the golden sand you have in your mind, and that alone is enough to fill your hat and big wooden shoes, right?"

Lang Xiaobai put the cloth bag on the floor and said to Ah Cai with a smile.

"Huh?"

Ah Cai jumped up in surprise. Ah Qiao also jumped up.

The two of them bent down to look at the contents of the cloth bag.

I saw bright and shiny gold sand, about one-third of the cloth bag. "I'll give it to you."

"What?! Give us ......" Ah Cai and Ah Qiao were shocked.

"Not bad. If you were the same as before, I wouldn't give you one. But now that the two of you have washed away your sins with tears of remorse and piety, it is equivalent to being reborn and becoming a new person, so I am willing to give it to you!

"I am very glad to see that you can change your ways, and I hope you have a happy marriage, and this is my gift to you! May you two be harmonious, smooth and happy!"

Lang Xiaobai's tone was full of sincere wishes, and Ah Cai and Ah Qiao were moved to tears.

After changing out of the wet clothes, Lang Xiaobai, Xiao Bin and Xie Yan sat in the hall and talked while sipping hot tea.

"The gold mine is upstream of the Gold Rush River, so the river washes the gold sand downstream, doesn't it?"

Xiao Bin asked Lang Xiaobai.

"No, there is no gold mine upstream at all."

"Why, then, does the bottom of the river settle so much gold sand?"

"I'll tell the truth right away! You look at this note first, Xiao Bin. Lang Xiaobai took out a note from his pocket, on which were written the Arabic numerals of the last line of Mr. Xie Yunqing's will.

"After carefully analyzing these Arabic numerals, I found that the '1' appears very frequently, and when I combine it with the numbers below, it becomes like this."

Lang Xiaobai wrote a line of words with a pencil:

31415169131415311129121314

"I understood right away: 14, 15, 16 may mean dates, and '3' and '9' may mean March and September.

Then, I carefully analyzed it and knew that every time Mr. Xie Yunqing came to the manor from Dongzhou, it was in March and September.

"So, why write about these two months? The reason, of course, is to get the gold sand in the water.

Mr. Xie Yunqing came to the manor on March 14, 15, 16, and September 13, 14, and 15 of the previous year. On March 10, 11, and 12 last year, he also came as usual; In order not to forget the date, he wrote it down at the end of his will.

However, Mr. Xie Yunqing passed away unexpectedly, so naturally he couldn't come. And yesterday was September 12th, and today is the 13th, which happens to be a date for taking gold sand.

Ah Choi is also very aware of this, which shows that he understands the secret of those numbers. He knew that on the 12th and 13th, he could get gold sand from the water, and that he would not get it at all on any other day.

So, he had planned to go to the river on September 12, which was yesterday. However, Xie Yan and Juanzi had no intention of leaving, which made him restless, so I took the two of you to the suburbs.

So, Ah Cai made an appointment with Ah Qiao at 1 o'clock this morning and came to the river, intending to use a cloth bag to get gold sand. However, because the bag is too light, it cannot sink into the water, so there is no gold sand at all. While they were puzzled, I shot them with a gun. ”

"Why is it only possible to get gold sand on September 12 and 13?"