"Speak up, what did you find?" Once we returned to the study, we immediately got down to business.
"Hehe..." Hua Yin pulled out a small notebook from his bag. As he opened it and glanced at his notes, he said, "This morning, I went to the Forensic Department to take a look at Yu Xin's body. By the time I saw it, the body had already been autopsied, which was pretty gruesome. But thankfully, I found something; otherwise, her death would have been in vain.
"First of all, I discovered that although Yu Xin's trachea and lungs contained algae and silt, indicating that she drowned in river water, there was something strange: her fingernails were filled with dirt from that little creek."
"That's obvious. If someone drowns in water, they would struggle and grab at things; it's not surprising to find dirt under their nails," I replied dismissively.
"That's not what I'm getting at! Can you let me finish?" Hua Yin rolled his eyes, sounding a bit impatient. "But here's the problem: do you remember the signs of binding on Yu Xin before she died? If she was tied up before her death, how could she have gotten so much dirt under her nails? If she wasn't bound when she died, then that creek is so shallow that it could only submerge half of a person; how could she have drowned?"
I recalled the appearance of the creek outside the back door. Indeed, with that depth of water, if her hands weren't tied, it would be impossible for her to drown—yet the forensic expert had confirmed she did drown!
"The only explanation I can think of is that Yu Xin drowned in the river but not in the creek where her body was found; it must have been in another river!" I suggested tentatively.
"Where do you think that might be?" Hua Yin pressed.
"I don't know yet, but I believe it should be in a deeper river because if the water isn't deep enough, it can't drown someone whose hands aren't bound," Hua Yin asserted confidently.
"That’s not necessarily true. Even if you threw me into a river, I wouldn't drown," I challenged him. "Because I can swim."
"But Yu Xin couldn't!" Hua Yin added quickly. "After seeing the body, I called my dad to confirm. According to the investigation, Yu Xin couldn't swim at all. Moreover, she felt embarrassed about not being able to swim in this day and age and kept it hidden. Not many people knew about this; only those close to her were aware."
"It's indeed a bit embarrassing not to know how to swim nowadays—more so than someone not knowing how to ride a bike," I teased.
"To hell with it! So what if I can't ride a bike? I don't give a damn about two wheels!" Hua Yin shouted, then calmed down and continued, "That means since Wang Keyi died, aside from our parents, not many people know about it."
"So that leaves only Mei Tiantian. Perfect, I want to find her and investigate as well. Let's go together tomorrow," I suggested.
"Sure, but don't rush. What I just mentioned is only the first point I've discovered today; there's still another point I haven't shared," Hua Yin teased.
"Why can't you just say everything at once?" I said, feeling a bit helpless.
"Alright, I'll continue. Your analysis was quite accurate, but you overlooked one thing. Besides Mei Tiantian, the only other person who knows Yu Xin can't swim is her boyfriend—Wang Qi." Hua Yin flipped a page in the booklet she was holding and continued, "And today, my dad and I went to find Wang Qi."
"What was the result?" I asked eagerly.
"I can't say we came back empty-handed, but the findings weren't substantial either. First of all, we did find out that Wang Qi had an alibi for the day of the incident. However, based on our previous deductions, we discovered a loophole in his alibi: the location of their gathering was precisely at 'Fisherman's Song' upstream on the Fuhe River."
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