She walked alone to the riverbank. The moon was large and bright that night, and its reflection in the water was so clear and perfect. The pure and bright moon floated slowly on the water, radiating a soft golden light.

Xiao Qianqian pulled her clothes tighter. The temperature was low at night, and even lower by the river. As soon as she reached the riverbank, she smelled the strange scent of the flowers. As she got closer, she realized that the flowers were even more vibrant and beautiful at night, shimmering with a dazzling luster.

The flower's long stamens stretched out, occasionally spraying out sap. In the still of the night, the sound of the sap spraying into the river could be heard clearly. She moved closer, intending to take a picture with her phone and then ask her senior brother if he knew what kind of flower it was.

Suddenly, she heard footsteps behind her. Startled, Xiao Qianqian turned around and saw a dark figure walking towards her. She nervously grabbed her phone, ready to call for help at any moment.

However, as the shadowy figure drew closer, she realized it was A'gen. A'gen, seeing her there, also showed a hint of surprise in his eyes.

"Dr. Xiao, what are you doing here?" A'gen asked.

Xiao Qianqian breathed a sigh of relief and pointed to the flower in front of her, saying, "I find this flower strange, but I can't find any information about it. I want to take a picture of it and ask others if they know what kind of flower it is."

“This flower is indeed very peculiar.” A’gen stepped forward and examined it carefully. “I’ve never seen it before either. It’s never been in our village before. I don’t know how it happened. It’s appeared in the last two months. It’s strange. I don’t know who planted it. Now that I look at it, this flower seems to be even more beautiful than when it blooms during the day.”

Xiao Qianqian nodded; she felt the same way. The flowers were indeed more beautiful than during the day.

"Oh, right, you said this flower wasn't here before, it only appeared in the last two months."

"Yes, it wasn't there before; it only appeared last month. Yes, last month. It hadn't bloomed yet, but the leaves and flowers looked strange, which is why we noticed it. At first, we didn't think there were many of them, and we didn't know what was going on. This month, it seems like there are many more. The main thing is that it bloomed this month, and the flowers are very beautiful. Many women in the village love this flower and often admire it."

Upon hearing A'gen's answer, something flashed through Xiao Qianqian's mind like lightning. It only appeared last month, but it bloomed this month, and the stamens even sprayed out sap. Could it be...?

She looked again at the flower stamens that were still spraying floral liquid, and took several photos with her phone. She seemed to have found the answer, but further research was needed to confirm it.

"Thank you, Argen. I've taken the photos and I'm heading back now."

"Dr. Xiao, let me take you back to your tent. I'm worried about you walking alone tonight."

"Okay, thank you."

After A'gen escorted Xiao Qianqian back to her tent, he was about to leave when Xiao Qianqian called him back.

"Ah Gen, wait a moment. Here's a bottle for you. Go and get some of the flower's spray."

"Okay." Argen took the bottle she handed him.

"Put on the gloves." Xiao Qianqian handed over another pair of medical gloves.

"I suspect one of the flower sap's saps is poisonous; wearing gloves is safer."

"Okay, Dr. Xiao, I'll go get it for you right away."

"Okay, thanks."

"You're welcome," A'gen said, scratching his head sheepishly. He took the bottle and walked to the flowers, carefully pinching the stamen of one blossom and positioning the bottle where the floral liquid would flow. The bottle quickly filled. A'gen tightened the cap and handed the bottle to Xiao Qianqian.

"Thank you, A'gen," Xiao Qianqian said with a smile. "You should go and rest first. We'll see what's so special about this flower elixir tomorrow."

Argen nodded and turned to leave the tent. Xiao Qianqian looked at the bottle in her hand, her heart filled with anticipation. She believed that this bottle of floral liquid would be the key clue to solving the mystery.

The next morning, Xiao Qianqian got up early and began analyzing the flower liquid. At the same time, she also sent the photos she took to her senior classmates' group, asking them to help identify what kind of flower it was and what its characteristics were.

"Junior Sister, what is this?"

"Junior sister, you went on a trip?"

"This flower is quite pretty. It seems familiar to me. Have I seen it somewhere before?"

Xiao Qianqian sent photos to her senior classmates and then got busy, no longer paying attention to the WeChat group.

The experts also entered the tent and were curious to see Xiao Qianqian busy at work.

"Xiao girl, what are you studying?"

"A type of floral sap."

"Flower nectar?"

"Yes, it's the flower that grows by the river. Its stamens spray out a kind of sap, and I suspect that the toxins in the river are sprayed out by this flower."

"Is there any evidence?" The middle-aged expert also came over, wanting to see what kind of flower liquid it was.

"I'll know once I study its ingredients."

"Okay, then we'll wait for your results. If it really is from this flower, then we'll finally find the source."

"Yes, finding the source means we've completed our mission and can go back now. We've been here for almost 10 days, and it's finally coming to an end."

Several experts are hoping to find the cause as soon as possible, as they have other things to attend to.

To give Xiao Qianqian a quiet environment, the group of them went for a walk by the river and took a look at the peculiar flower.

Xiao Qianqian was so engrossed in her research that she didn't even have lunch. It wasn't until almost evening that she stood up and stretched.

"Phew, finally the results are in. It wasn't a waste of all my time."

Seeing the expected result, she nodded in satisfaction. "I never thought there was such a peculiar way of poisoning people. The person who came up with this idea is truly talented. Or perhaps I underestimated him." Xiao Qianqian muttered to herself.

"Little Xiao, who do you think you're underestimating?" The tent was pushed open, and several experts walked in.

"I said I underestimated the person who poisoned the poisoner; that person is a real talent."

"You've figured it out?"

"Yes, it's the same as the poison in the river. The poison in the river is the sap sprayed by this flower. The person who thought of using this flower sap to poison the river is very vicious."

"It seems that this poisoning incident was likely a meticulously planned conspiracy," an expert analyzed.

“That’s right. To be able to use this rare flower sap for poisoning, the murderer must be very familiar with this environment,” another expert agreed.

At that moment, my eldest uncle walked in: "I heard you've got the results of your investigation?"

When everyone saw the president walk in, they quickly stood up.

"Yes, sir, Xiao just finished her analysis, and we were planning to report back to you later."

"Qianqian discovered it?"

"Yes, it was Xiao Yatou who discovered it."

"Qianqian, tell me how you discovered it."